Of the five quadratics listed below, four of them have two distinct roots. The fifth quadratic has a repeated root. Find the value of the repeated root.
-x^2 + 18x + 81
3x^2 - 3x - 168
x^2 - 4x - 4
25x^2 - 30x + 9
x^2 - 14x + 24
this is a different question. i posted it wrong on the other one...
Well the method was detailed.....you should be able to do it yourself now....
\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\) this is the quadratic formula....you should know it
b^2 - 4ac is the discriminant if it = 0 there is one (double) root
if it = perfect square there is two roots
if it <0 there are 2 imaginary roots
if it > 0 there are two real roots