SOLUTION: PLEASE HELP ME SOLVE THIS EQUATION FOR THE AXIS OF SYMMETRY: X^2-6X-7 THANKYOU:D

Question 444561: PLEASE HELP ME SOLVE THIS EQUATION FOR THE AXIS OF SYMMETRY: X^2-6X-7 THANKYOU:D
Answer by chriswen(106) (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=64 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 7, -1. Here's your graph:

After you solve you get 7 and -1.
(7+-1)/2=3
This is the midpoint between both numbers. The axis of symmetry is 3.
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