Find the derivative, f(x) = 5x + 9 at x = 2

Question

anonymous · Answer

that would be f'(x) = 5
so f'(2) = 5

anonymous · Answer

f'(x)=5 
f'(2)=5

anonymous · Answer

Thank you but how do I get this?

anonymous · Answer

5x+9 find the derivatives separately
the derivative of a constant number is always 0
for 5x use the derivative formula for multiplications
the derivative of 1st multiplied by 2nd variable plus the 1st variable multiplied by the derivative of the 2nd

anonymous · Answer

I'm sorry, but could you type the numbers out and go over it with me?

anonymous · Answer

5x
1st variable is 5, what is the derivative
2nd variable is x, what is the derivative

anonymous · Answer

I don't know, what is a derivative?

anonymous · Answer

$$f'(x)=\lim_{h \rightarrow 0}\frac{ f(x+h)-f(x) }{ h }$$

anonymous · Answer

does it make any sense

anonymous · Answer

for example derivative of 8x is 8 , 1/4x=1/4, $$\sqrt{2}x=\sqrt{2}$$

anonymous · Answer

okay yeah, I get it