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In a quadratic equation $a x^{2} + b x + c = 0$ , if $b^{2} - 4 a c = 0$ , then _________.

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a

It has two distinct roots

b

It has two equal roots

c

None of the above

d

It has no real roots

answer is A.

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Detailed Solution

If $b^{2} - 4 a c = 0$ , then the equation has two equal roots.

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In a quadratic equation ax2+bx+c=0, if b2-4ac=0, then _________.