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Standard Equation of Parabola

Given the equ...

Question

Given the equation $x^{2} - 2 x - 8 = 0$ , a possible value for $x$ is:

- 8

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- 6

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0

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4

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Solution

The correct option is D $4$
$x^{2} - 2 x - 8 = 0$
$\Rightarrow x^{2} - 4 x + 2 x - 8 = 0$
$\Rightarrow x (x - 4) + 2 (x + 4) = 0$
$\Rightarrow (x - 4) (x + 2) = 0$
$\Rightarrow x = 4, - 2$

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