Question

Factorised form f 2x2-x-1 is *
O
(x-1)(2x-1)
(x+1)(2x+1)
(x+1)(2x-1)
(x-1)(2x+1)​

Answer 1

Step-by-step explanation:

$2 {x}^{2} - x - 1 = 2 {x}^{2} - 2x + x - 1 \\ = 2x(x - 1) + 1(x - 1) \\ = (2x + 1)(x - 1)$

d) (x-1)(2x+1)

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