Question

If Ä= -4i and B = 6; then A.B will be. ​

Answer 1

Answer:

We have,

∣a+b∣

2

+∣a−b∣

2

=(a+b)(a+b)+(a−b)(a−b)

=a

2

+2ab+b

2

+a

2

−2ab+b

2

=2∣a∣

2

+2∣b∣

2

Therefore,

∣a+b∣

2

+∣a−b∣

2

5

2

+(a−b)

2

=2(3

2

+4

2

)

25+(a−b)

2

=50