Question

Simplify using identity
(iii) (7m - 8n)² + (7m + 8n)²​

Answer 1

Answer:

and

In this a = 7m and b = 8n

=

and

=

So,

=

+

=

or

remember that

Answer 2

Answer:

(7 m - 8 n) ² + (7 m + 8 n) ²

= 49m² - 112 mn + 64 n² + 49 m² + 112 mn + 64 n²

= 98 m² + 128 n²

Step-by-step explanation:

(a - b)² = a² - 2.a.b + b²

(a + b)² = a² + 2.a.b + b²

Hope it helps.

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