Question

Show that (3x+7)-84x=(3x-7)²
please tell me fast​

Answer 1

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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