# Thread: How to find F PRIME for this problem I'm working on

1. ## How to find F PRIME for this problem I'm working on

f ' (1) = (3x-4)(5x-6)

2. Originally Posted by calcconfused
f ' (1) = (3x-4)(5x-6)

You will need to use the product rule.

f'(x) = fg'+f'g

=(3x-4)(5)+ (3)(5x-6)

Then plug in 1 for your x values.

3. Originally Posted by mollymcf2009
You will need to use the product rule.

f'(x) = fg'+f'g

=(3x-4)(5)+ (3)(5x-6)

Then plug in 1 for your x values.
thats what i thought it was but apparently the answer is

30(1) - 38 = -8

i dk how that is the answer

4. nevermind i figured it out THANKS