Question

Q11- find value of |a×b|2+ |a.b|2

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Answer 1

Answer:

4ab

Step-by-step explanation:

4ab

Given, (a+b)

2

−(a−b)

2

.

We know, (a+b)

2

=a

2

+b

2

+2ab

and (a−b)

2

a

2

+b

2

−2ab.

Then,

(a+b)

2

−(a−b)

2

=a

2

+b

2

+2ab−(a

2

+b

2

−2ab)

=a

2

+b

2

+2ab−a

2

−b

2

+2ab

=4ab.