Question

show that (3 X + 7) 2 - 84 x=(x-7) 2​

Answer 1

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LHS =(3x+7)2−84x

Using , (a+b)2=a2+2ab+b2

=(9x2+42x+49)−84x

=9x2−42x+49

Using , (a−b)2=a2−2ab+b2

=(3x)2−2(3x)(7)+(7)2

=(3x−7)2= RHS

Answer 2

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