Explanation:
f(x) = x^2 + 3x + 2
f(0) = (0)^2 + 3(0) + 2
= 2.
f(x) = 0
x^2 + 3x + 2 = 0
(x + 1)(x + 2) = 0
x + 1 = 0 x + 2 = 0
x = -1 x = -2
hence x = -1 or -2.
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