y = 2x^2 - 3x -20

we need to determine x-intercept.

x-intercept is the point where the function intersect with the x-axis. In this case y value will be zero.

Then we need to calculate x values for the functin y to be zero.

y = 2x^2 - 3x - 20 = 0

Factor:

==> (2x +5)(x-4) = 0

==> x1= -2/5

==> x2= 4

Then y intersect with x-axis in two point:

(-2/5, 0) and (4, 0)

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