Factor 2(a+b)^2 + 5(a+b) - 3

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Factor the trinomial 2(a+b)^2 + 5(a+b) - 3
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My textbook says the answer is (a+b+3)(2a+2b-1)... I'm so confused.

blaircaccam
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wth, you literally just expanded, you didn't factor

kiritokazuto