For what value of ' \( a \) ', the curve \( y=x^{2}+a x+25 \) touch...

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For what value of ' \( a \) ', the curve \( y=x^{2}+a x+25 \) touches the \( \mathrm{x} \)-axis
P
(a) 0
(b) \( \pm 5 \)
W)
(c) \( \pm 10 \)
(d) None of these
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