TO find the zeros of a quadratic function we should factorize the function
[tex]x^2-x-20=(x-)(x+)[/tex]So we have to find numbers that multiplied are -20 and added are -1. So we get -5 and 4
[tex]x^2-x-20=(x-5)(x+4)[/tex]
so the zeros of the function are 5 and -4
