Answer:
The answer is 4 and -5.
Step-by-step explanation:
Working under the assumption that the first term is not 2x, but 2x², you can find the zero values by factoring the expression:
[tex]y = 2x^2 + 2x - 40\\y = 2(x^2 + x - 20)\\y = 2(x + 5)(x - 4)[/tex]
With it factored we can see that x being equal to -5 or 4 will give a zero value
Let's also see it plotted, as the question said to use a graphing calculator:
