Question

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

Answer 1

Correct answer is (b) q² = 4pr

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