Question

find all the zeros of the$y = x^2 - x - 20$ quadratic function

Answer 1

TO find the zeros of a quadratic function we should factorize the function

$x^2-x-20=(x-)(x+)$

So we have to find numbers that multiplied are -20 and added are -1. So we get -5 and 4

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

so the zeros of the function are 5 and -4