SOLUTION: I need help solving this quadratic equation. Every answer that I get looks nothing like the answer in the book. f(x)= -6x^2+8x+9

Question 433773: I need help solving this quadratic equation. Every answer that I get looks nothing like the answer in the book.
f(x)= -6x^2+8x+9
Answer by psbhowmick(878) (Show Source): You can put this solution on YOUR website!

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=280 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: -0.727766710890126, 2.06110004422346. Here's your graph:

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