Question

solve and send in copy



(7m-8n) ²+(7m+8m)²


​

Answer 1

Step-by-step explanation:

Given, (7m−8n)

2

+(7m+8n)

2

.

We know, (a−b)

2

=a

2

−2ab+b

2

and (a+b)

2

=a

2

+2ab+b

2

.

Then,

(7m−8n)

2

+(7m+8n)

2

=[(7m)

2

−2(7m)(8n)+(8n)

2

]+[(7m)

2

+2(7m)(8n)+(8n)

2

]

=(49m

2

−112mn+64n

2

)+(49m²

+112mn+64n²

)

=49m²

−112mn+64n²

+49m²

+112mn+64n²

=98m²

+128n²

Answer 2

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