Question

limits and derivatives

Answer 1

Find the derivative of f(x) = -12x2 + 9x at x = 6.

Answer 2

by hand ?

Answer 3

i.e.
\[\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}\]?

Answer 4

it would be -135 would it not?

Answer 5

f'(x) = -24x + 9 and for x = 6
==> -24*6 + 9

Answer 6

that is my guess, because next week you will be able to do the problem instantly in your head
now i think you are required to do it using the definition
am i right?

Answer 7

it is whatever \(-24\times 6+9\) is,

Answer 8

which is in fact \(-135\) so you win

Answer 9

ok @Hero, will do that

Answer 10

lol yay okay thx you guys c: