2 10 6 - Given A = 4 20 12 a. Find the basis for the row space and column space of A. b. Find the nullity of A.

Compute the product using the methods below. If a product is undefined, explain why. a. The definition where Ax is the linear combination of the columns of A using the corresponding entries in x as weights. b. The row-vector rule for computing Ax. A. a. Set up the linear combination of the columns of A using the corresponding entries in x as weights. Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. O B. + Xgây +Xz&2 + … +xnªn = (x₁ )ª₁ + (x₂)ª₂ + (×3)ª3 = ( C (Type the terms of your expression in the same order as they appear in the original expression.) 8 4 5 53 2 + 1 1 1 X₁ ª₁ +X₂ª₂ + ….. + xnªn = (×₁ )ª₁ + (×₂)ª₂ = (¯ + ( (Type the terms of your expression in the same order as they appear in the original expression.) OC. The matrix-vector Ax is not defined because the number of columns in matrix A does not match the number of entries in the vector x. D. The matrix-vector Ax is not defined because the number of rows in matrix A does…

3. Matrices and vectors a. Compute the following [2 marks] -5x² + 7y² + 2x² + 2xy +8xz - 6yz • -5x² + 7y² + 2z² + 2xy - 6xz+8yz · 5x² + 7y² + 2z² + 2xy +6xz-8yz • 5x² + 7y² + 2z² - 2xy - 6xz+8yz b. What's the inverse of (² (x y z) -5 1 -3 G+90- 1 7 4 -3 4 2 =? ? You should use the definition of inverse and check the conditions for each matrix in turn. [2 marks] 2 2/3 1/31 -1/3 1/3 (12) (-1/3 2/3)

A is an n x n matrix. Check the true statements below: A. Col(A) is the set of all vectors that can be written as Ar for some z. B. If the equation Ar = b is consistent, then Col(A) is R". C. The column space of A is the range of the mapping z + Ar. . D. The null space of A is the solution set of the equation Ar = 0. E. The null space of an m x n matrix is in R". OF. The kernel of a linear transformation is a vector space.