Question 11
If the zeroes of the quadratic polynomial ax2 + bx + c, a ≠ 0 are equal, then:
(a) c and a have opposite signs (b) c and b have opposite signs
(c) c and a have the same sign (d) c and b have the same sign
Since the zeroes are equal
D = 0
b2 − 4ac = 0
b2 = 4ac
ac = 𝑏^2/4
Since product of ac is positive
Both a and c will have the same sign
So, the correct answer is (C)

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.