Question

(7x +8y)2 – (7x – 8y)2 = 224xy

Answer 1

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$\sf{⟹ (7x +8y)2 – (7x – 8y)2 = 224xy}$

$\sf{⟹ 14x+16y-14x-16y = 224 xy}$

$\sf{⟹ 14x-14x+16y-16y=224xy}$

$\sf{⟹ 0=226xy }$

226 xy is the answer of this question ok