Answer: D
If the equation \(ax^2 + bx + c = 0 (a \ne 0)\) has equal roots:
\(b^2 - 4ac = 0\)
or, \(-4ac = -b^2\)
or, \(4ac = b^2\)
or, \(c = \cfrac{b^2}{4a}\).
If the equation \(ax^2 + bx + c = 0 (a \ne 0)\) has equal roots:
\(b^2 - 4ac = 0\)
or, \(-4ac = -b^2\)
or, \(4ac = b^2\)
or, \(c = \cfrac{b^2}{4a}\).
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