## isabel_xxvi one year ago Check: second derivative for : x-y=(x+y)^2

• This Question is Open
1. isabel_xxvi

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

2. isabel_xxvi

not sure if this is correct

3. Decart

did you differentiate implicity

4. isabel_xxvi

yeah

5. Decart

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

6. Decart

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

7. isabel_xxvi

uhm is it -1?