Question

(2x + 7y)^2 please expand this
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Answer 1

Answer:

(a-b)² = a² + b² - 2ab

(2x-7y)²

4x² + 49y² - 28xy

Answer 2

$\: \: \: \: \: ( {2x + 7y)}^{2} \\ \\ = {(2x)}^{2} + {(7y)}^{2} + 2 \times 2x \times 7y \\ \\ = 4 {x}^{2} + 7 {y}^{2} + 28xy$