Find the value m if x = - 4 is a zero of quadratic equation $4 x^{2} - m x + 5 = 0$ .
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Solution

Concept : 1 Mark
Application :1 Mark

If x=- 4 is a zero of quadratic equation

$4 x^{2} - m x + 5$

$∴ 4 (- 4)^{2} - m (- 4) + 5 = 0$

$\Rightarrow 64 + 4 m + 5 = 0$

$\Rightarrow 4 m + 69 = 0$

$\Rightarrow m = - \frac{69}{4}$ .

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