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Discriminant

Number of pos...

Question

Number of possible value(s) of integer ' $a$ ' for which the quadratic equation $x^{2} + a x + 16 = 0$ has equal roots, is

4

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6

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2

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none of these

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Solution

The correct option is C $2$
Given the quadratic equation $x^{2} + a x + 16 = 0$
D $= a^{2} - 4 \times 16 = 0$
$⟹ a = + 8, - 8$

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