Question

find the derivative of the function at the given number

f(x)=1-3x^2 at 2

i am confused i get -6xhsquared-6xh-h^2 all over h, plz help me

Answer 1

f'(x) = -6x
f'(2) = -18

Answer 2

-12

Answer 3

-18 was a typo..
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Answer 4

btw where r u gettin h from?? Or was ur equation:
(1-3x)^2 ?

Answer 5

can u post it properly?

Answer 6

1-3xsquared

Answer 7

h is in derivative formula?

Answer 8

are you using [f(x + h) - f(x)]/h

Answer 9

but why?? u will use diff rules for different problems, this one is just f' = -6x

Answer 10

if you know the short cut, but if you don't you use the formula

Answer 11

oh is he doin the limit definition?

Answer 12

i think so