Question

f'(a) 4/(sqrt1-x)

Answer 1

this does not make much sense.

Answer 2

\[\Large\bf\sf f(x)=\frac{4}{\sqrt{1-x}}\]

Find \(\Large\bf\sf f'(a)\)

Answer 3

Is that the problem?

Answer 4

I am pretty sure it is asking for the derivative of:\[y=\frac{ 4 }{ \sqrt{1-x} }\] at point a

Answer 5

Wait limit definition?

Answer 6

or is it asking to just find the derivative without the limit definition?

Answer 7

Saraahhhhhh +_+ Where are youuuu?

Answer 8

Sorry, this is the problem!
f(x)=4 / sqrt 1-x


Find f ′ (a)

Answer 9

well f'(a)=\[\lim_{h \rightarrow 0}\frac{ \frac{ 4 }{ \sqrt{1-(a+h)} } -\frac{ 4 }{ \sqrt{1-a} }}{ h }\]

Answer 10

do u know how to calculate limits?

Answer 11

sarah?

Answer 12

Yes, however I am stuck on what to do at this point. Do I multiply by LCD or conjugate?

Answer 13

I think maybe conjugate?

Answer 14

what do u mean by that can u show me how you do it by conjugate?

Answer 15

Use the quotient rule

Answer 16

no shes asking using the limit defintion

Answer 17

Oh wait, yeah I just noticed.

Answer 18

This is a fun problem, Sarah what have you done so far ^.^

Answer 19

that typed wrong. I have what mihirb posted earlier

Answer 20

Did you do anything with it though?

Answer 21

wow

Answer 22

No, that is where I am stuck