Question

For what values of $k$ does the quadratic equation $9x^2 + kx + 1 = 0$ have equal roots?

• A. $6,-6$
• B. $9,-9$
• C. $2,3$
• D. $-2,3$

Hint:

Whenever a quadratic equation asks for:
• Equal roots $\Rightarrow D=0$
• Distinct roots $\Rightarrow D>0$
• No real roots $\Rightarrow D<0$ Always start with the discriminant formula: \[ D=b^2-4ac \]

Answer 1

The Correct Option is A