Question

(X-7)^2 factories the given question

Answer 1

Using, (a-b)²= a²+b²-2ab

${(x - 7)}^{2} \\ = {x}^{2} + {7}^{2} - 2 \times x \times 7 \\ = {x}^{2} + 49 - 14x$

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