1. Lesson 6: Inverse of Matrices (part 3)
Accel Precalc
Unit 3: Matrices
Lesson 6: Inverse of Matrices (part 3)
EQ: How can you use the determinant to find the inverse of a matrix?

2. Part III: Using the Determinant to Find the Inverse
Given
Matrix A has an inverse A-1 iif det(A)  0. WHY?
CANNOT DIVIDE BY ZERO!!

3. Ex. Find A-1 using the determinant.
CHECK YOUR ANSWER!!

4. CHECK YOUR ANSWER!!

5. Since det (K) = 0, there is NO INVERSE for matrix K.3)
What does this mean?
Since det (K) = 0, there is NO INVERSE for matrix K.

6. ASSIGNMENT:
Practice Worksheet #13 – 18
Solve for the inverse using determinants.