Question

(2a+3b)^2-5(2a+3b)-14 factorise​

Answer 1

Answer:

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Answer 2

Answer:

let

$2a + 3b = x$

.....(i)

hence,

${(2a + 3b)}^{2} - 5(2a + 3b) - 14 \\ \\ = {x}^{2} - 5x - 14 \\ = { x}^{2} - 7x + 2x - 14 \\ = x(x - 7) + 2(x - 7) \\ = (x - 7)(x + 2) \\ using \: 1 \\ = (2a + 3b - 7)(2a + 3b + 2)$