Question

If A is a
A is a square matrix such that
A² = A then (1 +A²)-3A is​

Answer 1

Answer:

which class?

7th Or 8th?

Step-by-step explanation:

I hope this the right answer:-

by the way please check it. ☺

Given A2 = A

(I+A)2-3A=?

= I2 + A2 + 2IA - 3A { (a+b)2=a2+b2+2ab }

IA=A (by property)

Since A2=A and IA=A and I2=I

= I+2A+A−3A

= I