Chapter 12

Question 1

When multiplying matrices.

Answer 1

Rows of the first must equal collums of the second.

Question 2

A matrix doesn’t have an inverse when its….

Answer 2

Determinant is 0

Question 3

Area of a triangle with a matrix

Answer 3

Add vortexes with 1 to make a 3x3 matrix

1/2 the absolute value of the determinant will yield the area of the triangle.

Question 4

Solving systems of inequalities with matrices.

Answer 4

Create the matrices. Then times (A^-1)XB to get the variables.

Question 5

When adding and subtracting, the matrices

Answer 5

Must be the same shape