Question

Find the slope of the tangent line to the graph of f at the given point.

Answer 1

f(x) = x2 + 5x at (4, 36)

A. 13

B. 21

C. 9

Answer 2

could you first differentiate f(x) to get f'(x) ?
because slope is just f'(4)

Answer 3

so how would i do that though?

Answer 4

you know d/dx x^n = ... ?

Answer 5

no :(

Answer 6

oh, so this is the 1st time you are solving differentiation problems ... ?
you must be having a formula list right ?
search that and tell me whats derivative of x^n =...

Answer 7

i dont have my book by me right now so i looked it up and got this page http://www.math.com/tables/derivatives/more/x%5En.htm

Answer 8

i know the derivative, i wanted you to find out ....so see that and tell me what is derivative of x^n ?

Answer 9

im not understanding it at all !

Answer 10

....
d/dx x^n = n* x^ (n-1)
put n= 2 here

Answer 11

@Hero can you help?