SOLUTION: Find f(k) when f(x)=3x^2 + 4x + 5 I dont understand what to do with the f(k)? Please explain to me how to solve this problem.

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Question 895015: Find f(k) when f(x)=3x^2 + 4x + 5
I dont understand what to do with the f(k)? Please explain to me how to solve this problem.
Found 2 solutions by reviewermath, harpazo:
Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
Q:
Find f(k) when f(x)=3x^2 + 4x + 5
A:
Simply replace x by k.
f(k)=3k^2 + 4k + 5

Answer by harpazo(655) About Me  (Show Source):
You can put this solution on YOUR website!
f(k) means to replace every x you see in the function with k.
f(k) = 3x^2 + 4x + 5
f(k) = 3k^2 + 4k + 5
Did you follow?
For more practice, do this one on your own.
Find f(apple) = 3x^2 + 4x + 5.
Replace every x with apple and you're done.