SOLUTION: How do i solve by using the quadratic formula of x2 - 4x

SOLUTION: How do i solve by using the quadratic formula of x2 - 4x - 5 = 0

Question 24742: How do i solve by using the quadratic formula of x2 - 4x - 5 = 0
Answer by Alwayscheerful(414) (Show Source): You can put this solution on YOUR website!

Solved by pluggable solver: SOLVE quadratic equation with variable

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

Discriminant d=36 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 5, -1. Here's your graph:

Hope this helps!
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