ACT 2019 April(Z15) Math Question 18 Explanation - ACT Helper

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2019 April(Z15) Math Question 18
Quadratic Equations
- Factoring
Choice F
$x^{2} - 2 x + n = 0$ $x = 4,$ $\Rightarrow 4^{2} - 2 \cdot 4 + n = 0$ $\Rightarrow 16 - 8 + n = 0$ $\Rightarrow n = - 8$ $x = - 2,$ $\Rightarrow (- 2)^{2} - 2 (- 2) + n = 0$ $\Rightarrow 4 + 4 + n = 0$ $\Rightarrow n = - 8$
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