Question

find the value of k in the quadratic equation 9x2+kx+1=0 when the roots are equal

Answer 1

Answer:

+6 and -6

Step-by-step explanation:

Let the roots be a and a since roots are equal .

Sum of the roots is -b/c

2a=-k/9 (1)

product of root a^2=1/9

thus a=+-1/3 (2)

use (2) in (1)

thus k=+/- 6

Answer 2

answer : I hope it will help you to understand the basic concept used in this question.

thank you......