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
Correct answer is (b) q2 = 4pr
The roots of the quadratic equation px2-qx+r=0 are real and equal if q2=4pr.