A quadratic equation $x^{2} + k x + 2 = 0$ has one of its roots as $2$ . What is the value of $k$ ?

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Solution

The correct option is C $- 3$
Since $2$ is a root, it'll satisfy the given equation.
$\Rightarrow$ $(2)^{2} + 2 k + 2 = 0$
$\Rightarrow$ $4 + 2 k + 2 = 0$
$\Rightarrow$ $6 + 2 k = 0$
$\Rightarrow$ $k = - 3$

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