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...

Guest Mar 19, 2020

#2

#3**+2 **

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

ElectricPavlov
Mar 19, 2020