somebody help me??????

[mathhelp1a]

4 x^2 + 4 y^2 -2x + 8y -4 = 400

find derivative and simplify
is the answer

y' = 2-8x / 8y + 8

 

[Deleted member 4993]

4 x^2 + 4 y^2 -2x + 8y -4 = 400

find derivative and simplify
is the answer

y' = 2-8x / 8y + 8

How did you get that - please show your work.

 

[mathhelp1a]

8x + 8 yy' - 2 + 8 y'

8 y y' + 8 y' = 2 - 8x

y' = 2 - 8x / 8y + 8

 

[mathhelp1a]

help

 

[helenli89]

4 x^2 + 4 y^2 -2x + 8y -4 = 400

find derivative and simplify
is the answer

y' = 2-8x / 8y + 8

I would attempt this question as following:
4y^2 +8y = 4x^2 -2x +404
dy/dx (4y^2) + dy/dx (8y) = 8x-x
dy/dx * (4y^2+8y) = 7x
dy/dx = 7x / (4y^2+8y)

 

[Deleted member 4993]

4 x^2 + 4 y^2 -2x + 8y -4 = 400

find derivative and simplify
is the answer

y' = 2-8x / 8y + 8

4 x^2 + 4 y^2 -2x + 8y -4 = 400

8x + 8y*y' - 2 + 8y' = 0

8y'(y+1) = 2(1-4x)

y' = (1-4x)/[4(y+1)]

 

[mathhelp1a]

you can't simplify the answer ???
y' = (1-4x)/[4(y+1)]

 

[mathhelp1a]

somebody

 

[helenli89]

somebody

Stop posting!!!!!!!!!!! it's a simply question. Just google how to derivative single variable or read your text book!
And about how to simplify that equation, it's very simple, that equation just equals to y' = (1-4x)/(4y+4). I don't understand what the **** you want. This question is very simple. Maybe you should consider going to lecutres or reading the dam book! Move on!