Find the equation of -3 and 5

Answer 1

I am guessing that you are looking for a quadratic equation and those are the two x-values.

If x = -3 and x=5 then the it should be (x+3) (x-5)

do FOIL

The quadratic equation is x² - 2x -15

Answer 2

I've never seen a question like that before, so hopefully someone's looking for the most obvious answer.

-3 + 5 = 2

If there's more to that question, please let me know.