Question

$how \: to \: solve \: this \: question(2x + 7y) {}^{2}$
$formula \: (a + b) {}^{2} = a {}^{2} + b {}^{2} + 2ab \\ = (2x) {}^{2} + (7y) {}^{2} + 2 \times 2x \times 7y \\ = 4x {}^{2} + 49y {}^{2} + 28xy \: \: answer$
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Answer 1

Answer:

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