Q. 16

# Mark the Correct alternative in the following:

If one root of the equation is 4, while the equation has equal roots, the value of q is

A. 46/4

B. 4/49

C. 4

D. none of these

Answer :

given 4 is the root of x^{2} + px + 12 = 0

= 16 + 4p + 12 = 0

4p = - 28

P = -7

Given x^{2} + px + q = 0 has equal roots, then discriminant is 0.

D = b^{2} – 4ac = 0

p^{2} – 4q = 0

4q = 49

.

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