Question

I need help with this question!

Answer 1

A = 0 -7 b= 0 -7

3 2d 3 2d

Let's calculate A and B:

• A= 0*2d- 3*(-7) = -3*(-7) = 21
• B= 0.2d- 3*(-7) = -3*(-7) = 21

Calculte (AB)^(-1):

• (AB)^(-1) = (21*21)^(-1) = (21²)^(-1) = 21^(-2)

Calculte B^(-1) and A^(-1):

• B^(-1) * A^(-1) = 21^(-1) * 21^(-1)= 21^(-1-1) = 21^(-2)

so:

(AB)^(-1) = B^(-1) * A^(-1)