Given f(x) = 2x^2 + 3x - 20

We need to find the roots of f(x).

Then, we need to find x and f(x) values such that f(x) = 0

==> 2x^2 + 3x -20 = 0

We will use the roots formula :

==> x1= = (-3 + sqrt(9-4*2*-20) / 2*2 = (-3+sqrt9+160)/ 4 = (-3+13)/4 = 10/4 = 5/2 = 2.5

==> x2= (-3-13)/4 = -16/4 = -4

**Then the roots are: (-4, 0) and ( 2.5, 0).**

## See eNotes Ad-Free

Start your **48-hour free trial** to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Already a member? Log in here.