Multiple choice If the root of the equation $\displaystyle ax^{2}+bx+c=0$ are in the ratio $m:n$ then $\displaystyle mna^{2}=\left ( m+n \right )c^{2}$ $\displaystyle mnb^{2}=\left ( m+n \right )ac$ $\displaystyle mnb^{2}=\left ( m+n \right )2ac$ None of these Reveal answer Fill a bubble to check yourself C Correct answer