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The solution set of $x^{2} - x - 2 = 0$ is

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{1, 2}

{- 2, 1}

{- 1, 2}

{- 2, - 1}

answer is C.

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Detailed Solution

x^{2} - x - 2 = 0

$x^{2} - 2 x + x - 2 = 0$

$x (x - 2) + 1 (x - 2) = 0$

$(x + 1) (x - 2) = 0$

$x + 1 = 0 o r x - 2 = 0$

$x = - 1 o r x = 2$

Solution set $= {- 1, 2}$

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