SOLUTION: How do you solve x squared minus 6x minus 15 equals 0?

Question 916871: How do you solve x squared minus 6x minus 15 equals 0?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!

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You can complete the square, or use the quadratic equation.
Those 2 methods always work.
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Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)

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=96 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 7.89897948556636, -1.89897948556636. Here's your graph:

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