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Definition of Circle

Find the valu...

Question

Find the value of $k$ for which the curve $y = x^{2} + k x + 4$ touches the $x$ axis.

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Solution

$y = x^{2} + K x + 4$
$y = (x + 2)^{2}$ or $(x - 2)^{2}$
$∴ K = 4 o r - 4$

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