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Dec 21, 2020 · Solve: ( x − 4) ( x + 2) ( x − 1) ≥ 0. Solution. The zeros of a rational function occur when the numerator is zero and the values that produce zero in the denominator are the restrictions. In this case, Roots (Numerator) Restriction (Denominator) x − 4 = 0 or x + 2 = 0 x − 1 = 0 x = 4 x = − 2 x = 1.