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
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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.
*[invoke solve_quadratic_equation 1,18,-4]
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So it's 
-9 + sqrt(85)
-9 - sqrt(85)