Using the Identity solve the question (7m-8n)²+(7m+8n)²
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(7m-8n)²+(7m+8n)²=
(7m)^2 + (8n)^2 -2mn + (7m)^2 + (8m)^2 + 2mn
[(a+b)^2=a^2 + b^2 + 2ab
(a-b)^2=a^2 + b^2 - 2ab]
=14m^2 + 16n^2 + 14m^2 + 16n^2
=28m^2 + 32n^2
(7m)^2 + (8n)^2 -2mn + (7m)^2 + (8m)^2 + 2mn
[(a+b)^2=a^2 + b^2 + 2ab
(a-b)^2=a^2 + b^2 - 2ab]
=14m^2 + 16n^2 + 14m^2 + 16n^2
=28m^2 + 32n^2
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