SOLUTION: Answer the questions about the given function f(x)=-15x^2-17x if f(x)=-2 what is x?

Question 468054: Answer the questions about the given function
f(x)=-15x^2-17x
if f(x)=-2 what is x?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
-15x2-17x=-2
-15x2-17x+2=0

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=409 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: -1.24079161387189, 0.107458280538556. Here's your graph:

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