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If the roots of equation $ax^2 + bx + c = 0$, $a \neq 0$ are real and equal, then which of the following relation is true ?
- (a)$a = \frac{b^2}{c}$
- (b)$b^2 = ac$
- (c)$ac=\frac{b^2}{4}$
- (d)$c=\frac{b^2}{a}$
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Sol. (c) $ac=\frac{b^2}{4}$