In the equation $a x^{2} + b x + c = 0,$ it is given that $D = (b^{2} - 4 a c) > 0 .$ Then, the roots of the equation are
(a) real and equal
(b) real and unequal
(c) imaginary
(d) none of these

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Solution

(b) real and unequal
$If D = (b^{2} - 4 a c) > 0, the roots are real and unequal .$

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