11-12-2019
Mathematics

contestada

5) Is 3 a zero (or root) of f(x) = x3 - 9x2 + 11x + 21?

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MathPhys MathPhys

11-12-2019

Answer:

Yes

Step-by-step explanation:

f(x) = x³ − 9x² + 11x + 21

f(3) = (3)³ − 9(3)² + 11(3) + 21

f(3) = 27 − 81 + 33 + 21

f(3) = 0

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