Question

$(2x - y) {?}^{2} + 5(2x - y) - 6$
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Answer 1

Hey mate, here is your answer -:)

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$= {(2x - y)}^{2} + 5(2x - y) - 6 \\ = {4x}^{2} + {y}^{2} - 4xy + 10x - 5y - 6$

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HOPE it helps to you!!!