## anonymous 2 years ago Check: second derivative for : x-y=(x+y)^2

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1. anonymous

$\frac{ -4 }{ (2x+2y+1)^2 }$

2. anonymous

not sure if this is correct

3. anonymous

did you differentiate implicity

4. anonymous

yeah

5. anonymous

i did this a few weeks ago don't really remember i know we take the y and make a y prime

6. anonymous

the first dirivative would be y'=2(x+y)y' right \

7. anonymous

uhm is it -1?