if a is a square matrix such that a² = a, then write the value of 7a - (i + a)³ where i is an identity matrix.
Answers
Answered by
2
Answer:
given A2=A
7A−(I+A)3=7A−[I3+3A2I+3AI2+A3]
=7A−[I+3A+3A+A2.A]
=7A−[I+3A+3A+A]
=7A−I+7A
=−I
Answered by
5
Answer:
given A2=A
7A−(I+A)3=7A−[I3+3A2I+3AI2+A3]
=7A−[I+3A+3A+A2.A]
=7A−[I+3A+3A+A]
=7A−I+7A
=−I
Similar questions