SOLUTION: what to solve x^2+8x-4=0 by using the quadratic formula

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Question 500366: what to solve x^2+8x-4=0 by using the quadratic formula
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
what to solve x^2+8x-4=0 by using the quadratic formula
Solve for x, I suppose.
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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=80 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 0.47213595499958, -8.47213595499958. Here's your graph:
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