So I've got -5x^2+20x+2, and have to determine the x intercepts.
I can use partial factoring to get -5x(x-4)+2
from which I can get
Which gives me 0 and 4.
My issues that when I enter -5x^2+20x+2 into a graphing calculator, the x-intercept coordinates I am given are -0.098 and 4.098. I'd like to know why. Have I done something wrong?
Thanks so much for the help!