SOLUTION: in the equation y=2x?-5x-18, which is a value of x when y=0?

Question 130874: in the equation y=2x?-5x-18, which is a value of x when y=0?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
2x^2-5x-18=0 I assume that this is the problem.
x=-2, x=-4.5 See below
.
Ed

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=169 is greater than zero. That means that there are two solutions: .

Quadratic expression can be factored:

Again, the answer is: 4.5, -2. Here's your graph:

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