Find all of the real zeros of the function. Give exact values whenever possible. Identify each zero as rational or irrational.f(x) = x4 - 2x3 - 21x2 + 12x + 90

A. -3 (rational), 5 (rational), 2 +  (irrational), and 2 -  (irrational)
B. 3 (rational), -5 (rational), 2 +  (irrational), and 2 -  (irrational)
C. 3 (rational), -5 (rational),  (irrational), and - (irrational)
D. -3 (rational), 5 (rational),  (irrational), and - (irrational)

Answer: D

Mathematics

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