Given f(x)=x^3+kx-4, and x-1 is a factor of f(x), then what is the value of k?
1 answer:
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Answer:
C
Step-by-step explanation:
Express - 1 as an improper fraction, that is
- x = 9 ( multiply both sides by 5 )
- 9x = 45 ( divide both sides by - 9 )
x = - 5 → C