Well, isn't that a happy little question! When you multiply 20 by 0, you get 0. It's like having 20 friends over for a painting party, but if no one shows up, you still have a peaceful time painting by yourself.
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y = 0 gives 0 = - x - 20 so that x = -20 So the intercept is (-20, 0)
(x + 5)(x - 20) x + 5 = 0 x - 20 = 0 x = -5, 20
x2 = x+20 x2-x-20 = 0 (x-5)(x+4) = 0 x = 5 or x = -4
x2 + 9x + 20 = 0 ∴(x + 4)(x + 5) = 0 ∴x ∈ {-5, -4}
x2-35x+300 = 0 (x-15)(x-20) = 0 x = 15 or x = 20