Question

If the roots of the quadratic equation x² + px + 16 = 0 are equal then the value of p is 

A) ± 7 

B) ± 6 

C) ± 8 

D) ± 9

Answer 1

Correct option is (C) ± 8

For equal roots, we have D = 0

\(\Rightarrow p^2-4\times1\times16=0\)

\(\Rightarrow p^2=64\)

\(\Rightarrow p=\pm8\)

Answer 2

Correct option is C) ± 8