Question

समीकरण 2x2-x-1 = 0 के मूल होंगे
(a) 1,1/2
(b) -1,-1/2
(c) 1-1/2
(d) -1,1/2

Answer 1

Answer:

$2x {}^{2} - x - 1 = 0 \\ 2x {}^{2} - (2x - x) - 1 =0 \\ 2x {}^{2} - 2x + x - 1 = 0 \\ 2x(x - 1) + 1(x - 1) = 0 \\ (x - 1)(2x + 1) = 0 \\ x - 1 = 0 \: \: \: \: \: \: and\: \: \: \: \: 2x + 1 = 0\\ x = 1 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x = \frac{ - 1}{2}$

option c is the correct answer

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