Question

If roots of ax2 + bx+c= 0 are equal then which of the following is correct?
(A) b² = 4ac
(B)
b2 =2ac
(C) b2 = 3ac
(D)
b2 = ac​

Answer 1

Answer:

b^2=4ac.

Step-by-step explanation:

When the roots of the quadratic equation are equal then b^2=4ac.

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Answer 2

Answer:

Option (A)

As we know, when the roots of the quadratic equation are equal then b² - 4ac = 0. So, b² = 4ac.