1. The value of k for which equation 9x2 + 8xk+8 = 0 has equal roots is: (a) only 3
(b) only -3 (c) +or-3 (d) 9

Option C

+ or - 3

Step-by-step explanation:

A quadratic equation will have equal roots if its Discriminant is equal to zero.

the discriminant in this case is

considering the equation,

a = 9, b= 8k, c=8

Replacing the variables in the original equation with their respective values, we will have:

Note: The values of k are meant to be + or -2.12 as seen from the workings

However, these are not in the options given. the closest choice to it

is + or - 3