Question

Expand : (2x -7)
$(2x - {7)}^{2}$

Answer 1

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$\underline{SOLUTION}$ ➡

$We \: \: know \: \: that \:, \\ \\ (a - b) {}^{2} = a {}^{2} - 2ab + b {}^{2} \\ \\ By \: \: using \: this \: \: identy ,\: \: \\ \\ \\ (2x - 7) {}^{2} \\ \\ = (2x) {}^{2} - 2 \times 2x \times 7 + (7) {}^{2} \\ \\ = 4x {}^{2} - 28x + 49$

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Answer 2

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[Tex]\huge\star\Color{Blue}{Hello Mate}[/Tex]

[Tex]\Underline\Italic{Solution}[/Tex]

We know that,

$1.(a - b){2} = a {2} - 2ab + b {2} \\ by \: this \\ \ \ (2x - 7){2} \\ = > (2x) {2} - 2 \times 2x \times 7 + (7) {2} \\ = > (4x){2} - 28x + 49$
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