Find dy/dx:
y= 1/u^2 u=2x+3
I get 2x/(2x+3)^2

- anonymous

Find dy/dx:
y= 1/u^2 u=2x+3
I get 2x/(2x+3)^2

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- anonymous

the easy form is mus include :
-name of a drug
-history of drug
-street name
-short +long term effect
-how is it ingested
-what effects does it have on body
-anyother intersting facts

- anonymous

-4/(2x+1)^3

- anonymous

plz help me

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## More answers

- anonymous

i have to wirte an essay

- anonymous

I think you are in the wrong problem

- anonymous

what

- anonymous

i need to write my health easy idont want to fial

- anonymous

this is math

- anonymous

idc

- anonymous

can you go to the english section

- anonymous

i posted my question plz

- anonymous

you posted your question in my math question

- anonymous

plz

- anonymous

am sorry but can you help me

- anonymous

plz

- anonymous

if you go to "Home" at the top of the page and then click "English" I think, that is where you need to be

- anonymous

but theres no peole online yo help me i posted it 3x but no on helped me

- anonymous

I am a student just like you

- anonymous

To do these problems, I suggest utilize the chain rule as opposed to subbing in u into the original equation.

- anonymous

I got (2x+3)^-2 (2x)
then i got my answer

- anonymous

y=1/u^2, rewrite as y=u^-2 to make it easier to differentiate. Using the chain rule. y'=-2u*u'. Find u' by differentiating u=2x+3 with respesct to x. Sub in u and u' into y'=-2u*u' and you have your solution.

- anonymous

plz

- anonymous

I really messed that one up. I don't know what I was doing. Now I get the answer:
1/(-2x-3)^3

- anonymous

you are missing a coefficienet of 4

- anonymous

ok I am going to take it step by step now:
1st step is to get u^-2 and 2

- anonymous

differentiate y to get y'=-2u^-3*u'. Substitute in u and u' and that's it.

- anonymous

yes then I get -2u^-3 (2)
then
-2(2x+3)^-3 (2)
Am I good so far

- anonymous

yeah that's the right answer

- anonymous

ok then I get
(-4x-6)^-3 (2)
then I am wanting to make (-4x-6)^-3 into 2(-2x-3)^-3
This is where I think I am making the mistake

- anonymous

no you were already done. -2(2x+3)^-3 (2) is correct because the -2 multiples with the 2 to become -4. I don't really follow what you did in your last response

- anonymous

so will my answer be 2/-2(2x+3)^3

- anonymous

I feal like I need to do something with (2)

- anonymous

your -3 exponent is only applied to 2x+3 and not the -2, there is no need to bring it down

- anonymous

ok then it will be -4/(2x+3)^3

- anonymous

yes

- anonymous

Thank you for working through this problem with me and not just giving me the answer

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