The value of k for which polynomial $x^{2} - k x + 4$ has equal zeroes is

4

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2

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- 4

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- 2

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Solution

The correct options are
A $4$
C $- 4$
$x^{2} - k x + 4$ has equal roots $\Rightarrow D = 0$
$\Rightarrow k^{2} - 4 \times 4 \times 1 \Rightarrow k^{2} = 16 \Rightarrow k = \pm 4$

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