Question

please help solve this question (show your work)!!!!

use limit of x->a f'(a)=(f[x]-f[a])/(x-a) to find the derivative of f[x]=(x+1)^(-1/2), a=3

Answer 1

You there?

Answer 2

yes

Answer 3

try to first get a CD in your numerator...

Answer 4

let me know when you've got that part.

Answer 5

ok got it

Answer 6

what next?

Answer 7

now move the denominator you have 'upstairs' into the denominator of the whole expression.
then multiply the whole thing by the conjugate / conjugate: (see pic)

Answer 8

wait i made a mistake, instead of the (x+1)^(-1/2), its supposed to be^(1/2)...

Answer 9

here's the conjugate / conjugate