Question 16
If in applying the quadratic formula to a quadratic equation $$
f(x)=ax^2+bx+c=0,
$$ it happens that $c=\dfrac{b^2}{4a},$ then the graph of $y=f(x)$ will certainly:
f(x)=ax^2+bx+c=0,
$$ it happens that $c=\dfrac{b^2}{4a},$ then the graph of $y=f(x)$ will certainly: