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frez [133]
3 years ago
11

Given f(x)=x^3+2x+k. and x+1 is a factor of f(x), then what is the value of k?

Mathematics
1 answer:
Ludmilka [50]3 years ago
4 0

Answer:

k = 3.

Step-by-step explanation:

By the Factor Theorem. if x+a is a factor of f(x)  then f(-a) = 0.

Here we use f(-1):

f(-1) = (-1)^3 + 2(-1) + k = 0

-1 - 2 + k = 0

k = 3.

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