SOLUTION: Solve the equation x+ 3x^2-18x-40=0

Question 1133827: Solve the equation x+ 3x^2-18x-40=0
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Solve the equation x+ 3x^2-18x-40=0
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3x^2-17x-40=0

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=769 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 7.45514154128735, -1.78847487462068. Here's your graph:

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