Difference quotient (i know this is right) but it is telling me otherwise

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ihatecats2014
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Homework Statement



Given the function , calculate the following values f(x) = 2-5x
f(a)
f(a+h)
f(a+h)-f(a)/h

The Attempt at a Solution



f(a)= 2-5x
f(a+h)= 2-5(x-h)
f(a+h)-f(a)/h = -5

i am 100% sure but the darn computer is telling me that f(a) and f(a+h) is wrong.
my calc professor is using webwork which is super stupid. it is telling me : " Variable 'x' is not defined in this context" how am i suppose to put in the answer if i already have it?
i emailed my professor, but she was unhelpful stating something totally unrelated, and it is due tomorrow i need help please
 
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never mind i got it.


ihatecats2014 said:

Homework Statement



Given the function , calculate the following values f(x) = 2-5x
f(a)
f(a+h)
f(a+h)-f(a)/h



The Attempt at a Solution



f(a)= 2-5x
f(a+h)= 2-5(x-h)
f(a+h)-f(a)/h = -5

i am 100% sure but the darn computer is telling me that f(a) and f(a+h) is wrong.
my calc professor is using webwork which is super stupid. it is telling me : " Variable 'x' is not defined in this context" how am i suppose to put in the answer if i already have it?
i emailed my professor, but she was unhelpful stating something totally unrelated, and it is due tomorrow i need help please