If one root of the equation $2 x^{2} + a x + 6 = 0$ is 3, then find the value of $a$ .

-8

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Solution

The correct option is A
-8

Step 1:- If one root of the equation $2 x^{2} + a x + 6 = 0$ is 3, then substitute $x = 3$ in the equation,

Step 2:- $2 (3)^{2} + 3 a + 6 = 0$

$\Rightarrow 18 + 3 a + 6 = 0$

Step 3:- $24 + 3 a = 0$

$\Rightarrow a = - 8$

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