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If the line $2 x+y+k=0$ is normal to the parabola $y^2=-8 x$, then the value of $k$ will be
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The correct answer is:
$24$
$y=-2 x-k$ is normal to $y^2=-8 x$
or $-k=-\left\{-4(-2)-2(-2)^3\right\}=-(8+16) \Rightarrow k=24$.
or $-k=-\left\{-4(-2)-2(-2)^3\right\}=-(8+16) \Rightarrow k=24$.
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