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The roots of the quadratic equation px2-qx+r=0 are real and equal if:

(a) p2=4ar

(b) q2=4pr

(c) -q2=4pr

(d) p2>4qr

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Correct answer is (b) q= 4pr

The roots of the quadratic equation px2-qx+r=0 are real and equal if q2=4pr.

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