Antiderivative problem that confuses me

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Consider the function f(x) = 2/x^3 - 9/x^6.
Let F(x) be the antiderivative of f(x) with F(1) = 0.
The F(2) equals ???

I took the antiderivative and came up with...

-1/x^2 + 9/5x^5 + C

Now, I'm confused because I thought you would plug 1 into the antiderivative and get 0, but for some reason I don't. So I'm not really sure what to do with the 2.

Any help would be appreciated! Thanks!
 
Use F(1)=0 to find C
Then put C into F(x).
Then find F(2).
 
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