SOLUTION: solve. x^2+18x-4=0. Do I use the quadratic equation or do I factor this to solve it? Please and thank you for your help

Question 177883: solve.
x^2+18x-4=0. Do I use the quadratic equation or do I factor this to solve it?
Please and thank you for your help
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
solve.
x^2+18x-4=0. Do I use the quadratic equation or do I factor this to solve it?
Please and thank you for your help
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I don't see how it can be factored.
If the factors are not obvious, use the quadratic formula, it always works and is often useful in factoing.

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=340 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 0.219544457292887, -18.2195444572929. Here's your graph:

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So it's
-9 + sqrt(85)
-9 - sqrt(85)

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