Hi:
If 8y(x+y)=4x, find an expression for dy/dx
8y(x+y)=4x
u=8y
v=(x+y)
du/dx=8
dv/dx=1
dy/dx=8y.1dy/dx+(x+y).1=9
dy/dx=8ydy/dx+(x+y)=9
I'm not sure if my method is solid here. Would somebody please check this for me. Thanks
I'm really missed some fundamentals from my lectures on this. I have a video tutorial I think I will watch before I fire some questions back, if that's ok.
In the meantime: I just bought mathtype so I can put my workings in Latex for easy comprehension, and managed to create the problem in the program. But how do I get it into this window without uploading an image file?
Hello, stealthmaths!
Sorry, I can't follow your work . . .
If find an expression for
First, I would divide by 4: .
Then I would expand: .
Differentiate implicitly: .
. . . .Rearrange terms: . . . .
. . . . . . . . . . .Factor: . . . . .
. . . . . . . . Therefore: . . . . . . . . . . .