Use the graphing calculator to graph the quadratic function y = 2x2 + 2x – 40. What are the zeros of the function?

To find the zeros, set y equal to 0: 2x² + 2x − 40 = 0. Divide by 2 to get x² + x − 20 = 0, then factor: (x + 5)(x − 4) = 0. Thus x = −5 or x = 4, so the zeros are 4 and −5, choice A.

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