If a root of $x^{2} - k x + 8 = 0$ is 4, then $k =$

7

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3

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6

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8

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Solution

The correct option is C $6$
Given: equation $x^{2} - k x + 8 = 0$ , and one of the root is 4
To find the value of k
Sol:
$x^{2} - k x + 8 = 0$ , if 4 is one of the root then it should satisfy the following condition
$4^{2} - k (4) + 8 = 0 ⟹ 16 - 4 k + 8 = 0 ⟹ 4 k = 24$
or $k = 6$

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