Question

A is a square matric such that A²A, then write
the value of 'I +A) 23A​

Answer 1

Answer:

GIven A

2

=I

(A−I)

3

+(A+I)

3

−7A

={A

3

−I

3

−3AI(A−I)}+{A

3

+I

3

+3AI(A+I)}−7A

=2A

3

+6AI

2

−7A

=2(A

2

)A+6A−7A

=8A−7A

=A