Question

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

Answer 1

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:

$y = 2x^2 + 2x - 40\\y = 2(x^2 + x - 20)\\y = 2(x + 5)(x - 4)$

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: