Can you help me understand part a and b?

Week 2 Written Assignment Page 4 4x + 4 5. f(x) = - 23 - x2- 2x (a) Find all x-values that make the numerator zero. SHOW YOUR WORK. (b) Find all points of discontinuity; in other words, find all x-values that make the denominator zero. SHOW YOUR WORK. (c) List any x-intercepts in the left box or write "none" if there are no x-intercepts. List any vertical asymptotes in the middle box or write "none" if there are no vertical asymptotes. Remember that an asymptote is a line, which means you must write an equation, not just a number. List any x-values at which f(x) has a hole in the right box or write "none" if there are no holes. x-intercepts vertical asymptotes holes 4 x + 4 = 0 x 3 - x2 - 2x X = -1 - 4- 4 x(x2-x-2) 4 x = - ' x (x+ 1) ( x- 2 ) 4 X = / X: 0 x=- 1, X= 2