Question

plz tell the accurate answer with proper steps !​

Answer 1

Answer:

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Answer 2

(3x+7)²-84x

=(3x)²+2.3x.7+(7)²-84x [using the formula (a+b)²=a²+2ab+b²]

=(3x)²+42x+(7)²-84x

=(3x)²-42x+(7)²

=(3x)²-2.3x.7+(7)²

=(3x-7)² [using the formula (a-b)²=a²-2ab+b²]

so, (3x-7)² is the answer.