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The two roots of a quadratic equation are 2 and –1, the equation is

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

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

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

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

answer is D.

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Detailed Solution

$α = 2, β = - 1$

$x^{2} - (α + β) x + α β = 0$

$x^{2} - (2 - 1) x + (2) (- 1) = 0$

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

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