Question

2(a+b)^2+5(a+b)-3=?

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Answer 1

let (a+b)=X

now....

$2x {}^{2} + 5x - 3 \\ = 2x {}^{2} + 6x - x - 3 \\ = 2x(x + 3) - 1(x + 3) \\ = (x + 3)(2x - 1) \\ = (a + b + 3)(2a + 2b - 1)$