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 isA. 46/4B. 4/49C. 4D. none of these

Answer :

given 4 is the root of x2 + px + 12 = 0

= 16 + 4p + 12 = 0

4p = - 28

P = -7

Given x2 + px + q = 0 has equal roots, then discriminant is 0.

D = b2 – 4ac = 0

p2 – 4q = 0

4q = 49

.

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