2) Main Idea: A sign chart helps you record information about a function's values around its zeros and vertical asymptotes. Follow these steps to make a sign chart for the function F(x) = =(x - 1) (x+1) (x - 2)(x+ 2) Step 1: Find all the zeros and vertical asymptotes. Definition How do you find it? Do it A zero is any x-value Find any x-values that zeros: that makes the make the numerator X = and X = function equal 0. equal A vertical asymptote Find any x-values that vertical asymptotes: is any x-value that make the denominator X = and x = makes the function undefined