SOLUTION: Please help me solve this problem. Determine all the x-values that are solutions to x2+x-1=0.

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Question 638390: Please help me solve this problem. Determine all the x-values that are solutions to x2+x-1=0.
Answer by reviewermath(1029)   (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=5 is greater than zero. That means that there are two solutions: .




Quadratic expression can be factored:

Again, the answer is: 0.618033988749895, -1.61803398874989. Here's your graph:

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