Question

Find the derivative of f(x) = 7x + 9 at x = 6.

Answer 1

f(6) = 7*6 + 9 = 42+9
f(6) = 51

Answer 2

CCan you just use the derivative rule? Or must you do this with the limit definition?

Answer 3

using first principles?
or can you directly use the derivative formulas?

Answer 4

did i do it right?

Answer 5

lol, hi5 kirb :P :)

Answer 6

Hehe

Answer 7

hey barbie, this question belongs to the derivative topic!

Answer 8

I thought that's how you did it but my choices are:
7

9

6

0

Answer 9

nice try though :) but its not correct...

Answer 10

oh okay sorry i couldn't help :/

Answer 11

since you're given choices, lets use the easiest way

Answer 12

derivative of x is 1
derivative of constant = 0

this is got from the standard relation,
\(\Large d/dx (x^n ) = n x^{n-1}\)

Answer 13

so derivative of 7x will be 7(1) = 7
and
derivative of 9 is 0

overall,
derivative of
7x+9 is simply 7 :)

Answer 14

hey @hartnn can u please help me?

Answer 15

ohh okay, do you think you could help e walk through one more?

Answer 16

@hartnn