Question

If the roots of the equation $X^2-8X+C=0$, are equal then $C$ is equal to _______.

• A. $\left(16\right)$
• B. $\left(6\right)$
• C. $5$
• D. $\left(4\right)$

Answer 1

The correct option is A $\left(16\right)$

If roots are equal then the discriminant is

$\Rightarrow b^2-4ac=0$

$\frac{b^2}{4a}=c$

for $e{q}^n{n}^2-8x+c=0$

$a=1,b=-8$

$c=\frac{8^2}{4}=16$

So, $C=16$