# If f (x)=x^99+ 99x + k is divisible by x + 1 , then k = A. −100 B. −98 C. 98 D. 100 E. 198

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### 1 Answer

`f(x) = x^99 +99x+k`

Using remainder theorem if fully `f(x)` is fully divided by ` (x-a)` then` f(a) = 0` ;

`f(-1) = 0`

`f(-1) = -(1)^99+99(-1)+k = 0`

`-1-99+k = 0`

`K = 100`

*So the answer is k = 100. Correct answer is at option D).*

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