Show that (3x+7)-84x=(3x-7)²
please tell me fast
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LHS
(3x+7)^2-84x
={(3x)^+(7)^+2(3x)(7)}-84x
=9x^2+49+42x-84x
=9x^2+49-42x
=(3x)^+(7)^-2(3x)(7)
=(3x-7)^2
RHS
(3X-7)^2
As LHS=RHS, Hence proved.
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