Besvarelser til Lineær Algebra Reeksamen Februar 2017
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1 Besvarelser til Lineær Algebra Reeksamen - 7. Februar 207 Mikkel Findinge Bemærk, at der kan være sneget sig fejl ind. Kontakt mig endelig, hvis du skulle falde over en sådan. Dette dokument har udelukkende til opgave at forklare, hvordan man kommer frem til facit i de enkelte opgaver. Der er altså ikke afkrydsningsfelter, der er kun facit og tilhørende udregninger. Udregningerne er meget udpenslede, så de este kan være med.
2 Indhold Problem 3 Problem 2 4 Problem 3 5 Problem 4 7 Problem 5 8 Problem 6 9 Problem 7 0 Problem 8 Problem 9 3 Problem 0 4 Problem 5 Problem 2 6 Problem 3 7 Problem 4 8 2
3 Problem Consider the matrices A = , B = , and answer the following questions.. Is A in row echelon form? No, all zero rows must be at the bottom of the matrix. 2. Is B in row echelon form? Yes, there is no non-pivot row before a pivot row and below each pivot entry there are zeros. 3. Is A in reduced row echelon form? No, if it is not in row echelon form it can not be in reduced row echelon form! 4. Is B in reduced row echelon form? No, we need 0 both below AND over each pivot entry. 5. Can B be obtained from A by elementary row operations? No, there is only zeros in the rst column of A which is not the case of B. Another way of seeing this is noticing, that x is a free variable of A, but this is not the case of B. 6. Can A be obtained from B by elementary row operations? No, if you can not go one way with elementary row operations, then you can not go the other way. 3
4 Problem 2 Let A = [a a 2 ] be a matrix with 4 rows and let B = [b b 2 b 3 b 4 b 5 ] be such that C = AB is dened.. How many rows are there in the matrix B? We know that A is a 4 2-matrix. Hence for AB to be dened B must be a 2 5- matrix (we already know that B has 5 columns). We conclude that B has 2 rows. 2. How many rows are there in the matrix C? Since A is the leading matrix C must have the same amount of rows as A meaning 4. 4
5 Problem 3 Let A = [ ] and let B = 5 A. a) A is an orthogonal matrix. False, the columns does not have length. b) B is an orthogonal matrix. True, because: 5 [ ] 4 [ ] 3 = ( ( 4)) = Hence the columns are orthogonal. They have the same length, but is the length? = 25 = =. Yes, the length is, therefore the matrix is orthogonal. c) A is a symmetric matrix. True. For A to be symmetric, we must have A = A which is the case. d) B = B. False. We know that B is an orthogonal matrix. That means B = B. Furthermore we know that A is symmetric, which means B is symmetric and therefore B = B. But then B = B = B. But B = B only if B is a matrix consisting of only zeros - which is not the case. e) B = B. True - see d) for reasoning. 2. What is the determinant of B? We have det B = det 3. x = [ x x 2 ( ) 5 A = ] ( ) 2 det A = 5 25 (4 ( 4) 3 3) = 25 ( 6 9) = =. be an eigenvector of B with eigenvalue. What is the value of x if x 2 =. Eigenvectors and their responding eigenvalues should satisfy the equation: Bx = λx. 5
6 Let us nd the left hand side of the equation rst: Bx = [ ] [ ] 4 3 x = [ ] 4x x 4 [ ] x Since λ = and x = we see that 5 [ ] 4x + 3 = 3x 4 [ ] x. There is only one unknown variable, x, so only one equation is needed. We get: 5 (4x + 3) = x 4x + 3 = 5x x = 3. 6
7 Problem Let A = 2 4 and b = 3. The augmented matrix has the following reduced row echelon form a) Column is a pivot column. True, because it is the leading digit of the row and there are zeros below. b) Column 2 is a pivot column. True, because it is the leading digit of the row and there are zeros below. c) Column 3 is a pivot column. False, because it is not the leading digit of the row. d) Column 4 is a pivot column. True, because it is the leading digit of the row and there are zeros below. 2. What is the rank of A? The rank is 3 because A has 3 pivot entries. 3. What is the nullity of A? Since A has rank 3 and only consists of 4 columns the only 4 3 = dimension is left over for the nullity of A. 4. Let x be a solution of Ax = b. What is x 2? By nding the pivot entry of the second column of we see that x 2 should be 2 (read the last entry of the row, that x 2 is pivot entry for). 7
8 Problem Let A = and B = Let C = AB. What is the number c 3? Answer: By the denition of matrix product we can just multiply the rst row of A with the third row of B. We have: [ ] = ( 5) 2 = =
9 Problem 6 Let v = and let W = span{v}. Let u = projection of u on W and let w be the orthogonal. What is the third component of w (i.e. w 3 )? We use the formula We get w = ( ) + ( ) ( ) 2 + ( ) 2 w = u v v 2 v. = = 4 4 = The third value of w is then. (Strictly speaking there is no reason to do the calculations for the entire vector, but whoever is reading this probably would have gotten confused if I let the other values out). 2. Let z be the orthogonal projection of u on W. What is the third component of z (i.e.)? We know that u = w + z hence z = u w and therefore z 3 = u 3 w 3 (we only need the third component of each vector): z 3 = 2 ( ) = What is the dimension of W? Since the vectors belong to R 4 and W = span{v} (W is only spanned by vector, meaning it has only dimension ) we know that dim ( W ) = 4 = 3.. 9
10 Problem 7 Let A and B be 3 3 matrices with det A = 5 and det B = 3.. What is det( 2A)? We will use the a property of determinants. We have: det( 2A) = ( 2) 3 det A = 8 det A = 8 5 = 40. Reminder of property: The determinant of det(kc) where k is a scalar and C is a n n-matrix is given by det(kc) = k n det(c). 2. What is det AB? We will use two other properties. The rst property is det(cd) = det C det D for C and D being n n-matrices. The second is det(c ) = det(c). We have: det(ab ) = det(a) det(b ) = det(a) det(b) = 5 3 = What is det AB? We will use the matrix multiplication property of the determinant as in 2. Furthermore we will use the property, that det(c ) = det(c) =. We have: det(c) det(ab ) = det(a) det(b ) = det(a) det(b) ) = det A det B =
11 Problem The characteristic polynomial of A = is t(t 2)(t + ) Which one of the following is an eigenvalue of A? It is because eigenvalues are the values of t that makes t(t 2)(t + ) 2 = Which one of the following is an eigenvector of A? (a) 0 0 0, 0 (b) 0, 0 (c) 0, 0 (d) 0 0 The zero-vector (a) can not be an eigenvector per denition of eigenvectors (all non-zero vectors, that satisfy Av = λv). We multiply A with each vector, (b), (c) and (d) independently. We have for (b): A 0 = = ( 2) = = (b) can not be an eigenvector, because we can not nd a scalar λ such that: 4 0 = λ Similar calculations are done for (c): ( 2) A 0 = = ( 2) = = (c) can not be an eigenvector, because we can not nd a scalar λ such that: = λ
12 Similar calculations are done for (c): A 0 0 = = Since ( 2) A 0 0 = = we have that (d) is an eigenvector with the corresponding eigenvalue Is A invertible? = = No! Why? Because A is only invertible if 0 is NOT an eigenvalue of A - and in this case 0 is an eigenvalue because for t = 0 the characteristic polynomial t(t 2)(t+) 2 will equal 0. 2
13 Problem 9 Let What is the determinant of A? A = Answer: Using the cofactering method around the third 3 row, we get: det(a) = ( ) 3+ 0 det A 3 +( ) 3+2 det A 32 +( ) det A 33 +( ) det A 34 = det A where A 32 = 2 3 is the submatrix of A where third row and second column 3 4 is removed. Using the cofactering method on this matrix around (just picking a random row) the rst row we obtain the determinant for this: 2 2 det A 32 = det = ( ) + 2 det [ ] 3 + ( ) +2 det 3 4 = 2( 4 3 3) (2 4 3 ) + 2(2 3 ) [ ] ( ) +3 2 det 4 = 2(4 9) (8 3) + 2(6 ) = 2 ( 5) = 5. So det A 32 = 5 and since A = det A 32 we have that A = ( 5) = 5. [ ] 2 3 3
14 Problem 0 What is the number of solutions of the following system of linear equations Answer: x x 2 + x 4 = 0 x x 2 + x 3 + x 4 = 0 x + x 2 x 4 = We can setup a corresponding matrix for the system of linear equations and reduce it to echelon form: Since the last row has a pivot entry in the last column the system is inconsistent meaning there is 0 solutions. 4
15 Problem [ ] 3 2 Let T be the linear transformation with standard matrix A =. [ ] [ ] 4 2 B = {, } is a basis for R 0 2. What is the matrix representation of T with respect to B, denoted by [T ] B? Answer: We will use the formula [T ] B = B AB, [ ] 2 where B = The determinant of B is: 0 which gives us the inverse of B: B = det B det B = ( 2) 0 =, [ ( 2) 0 We can now use the formula and get: ] = [ ] 2 = 0 [ ] 2. 0 [T ] B = B AB [ ] [ ] [ ] = [ ] [ ] = [ ] [ ] 4 2 = 4 0 [ ] = [ ] 8 =
16 Problem 2 Let T : R n R m be the linear transformation with the standard matrix 0 A = What is the value of n? The question is "What is the size of a vector v for Av to be dened?- The only way we can multiply A with v like that is for v to be of dimension 3. Hence n = What is the value of m? The question is "What size does the resulting vector of Av have?- The resulting vector has the same amount of rows as A hence m = What is the rank of A? We will reduce A to echelon form: Since the echelon form of A has 3 pivot columns the rank of A is What is the dimension of the null space of T? There are no non-pivot columns in A, hence the null space has no dimension (i.e. the dimension of the null space of T is 0). 5. Is T one-to-one? Is T injective? Yes, T is injective whenever all columns are pivot entries (i.e. when the null space has dimension 0). 6. Is T onto? Is T surjective? No, for T to be surjective there must be a pivot entry in all rows of A. This can not be true when there are more rows than columns. 6
17 Problem Let A = 2 and let b = 3 and c = Is b contained in Col A? We have to see if the system Ax = b is consistent: We know have the system on echelon form hence the system is consistent since there is no pivot in the last column. Therefore b is contained in Col A. 2. Is c contained in Col A? No, because the dimensions of c does not t the dimension of the column vectors in A. 3. Is b contained in Null A? No, since b lies in Col A. 4. Is c contained in the Null A? We have to multiply A with c and see if we get the zero vector: 2 Ac = 2 0 ( ) ( ) = 2 ( ) + ( ) = = ( ) Hence c is in Null A. 7
18 Problem 4 The following commands are entered in the MATLAB Command Window: A = [ ; 2 3 4; 0 0 ; ]; b = [; 0; ; 2]; T = [A b];. What is the size of the matrix T? T has the size of A + an extra column (b). Since A has size 4 4, T has size 4 (4 + ) = The equation Ax = b has a unique solution x. Which combination of MATLAB commands computes x? When a unique solution exists, the last column of the matrix on reduced row echelon form yields x. Hence we can use R=rref(A) to obtain the reduced row echelon form and store it in R. To read the last column we simply write x = R[:,5], because ":"indicates all rows and 5 indicates the fth (and therefore last) column of R. So we fetch all rows of the fth column. 8
19 Problem 5 To be continued... Unless I die... or get kidnapped... or get struck by laziness - which is likely. 9
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