# Thread: [SOLVED] Am I right? A simple derivative question

1. ## [SOLVED] Am I right? A simple derivative question

Use the definition of the derivative to find f '(x)

f(x)=6x^3-7x

my answer is 18x^2+18xh-7

2. Originally Posted by Soul to soul
Use the definition of the derivative to find f '(x)

f(x)=6x^3-7x

my answer is 18x^2+18xh-7
h goes to zero in the definition, does it not?

3. yes, it does

and I didn't get this one:
Use the definition of the derivative to find f '(x): f(x)= square root of 3x+2

can somebody help me?

4. You got the original question correct. Make a new thread for a new problem please.