Question

Which one of the following does not find the value of f ′(2) for f(x) = x^2 + 3x + 1?

Answer 1

what is f'(x)?

Answer 2

@chris215
What did you get for f'(x)?

Answer 3

you want
f(x+h) - f(x)

the first choice only subtracts part of f(x) i.e. it does not have parens in the correct place
2nd choice shows how it should look.

Answer 4

Although the 3rd line is not standard, I believe it also gives the correct value.

I would use choice B and if it it want more than 1 , both B and C