1. Find Constant of Intergration

(x^2+1)^2 dy + 20x dx = 0

Find Constant of Integration 'C' ,when x = 2 and y =7.

Any help appreciated.

2. Thanks very much for that ,
just a Quick Question you have a '-10' in front of the intergrand and then it diappears in the following line ,just wondering how that is the case.
The neg sign I mean
thanks again

3. Remember:
$[{1/f(x)}]'=-{f(x)}'/f(x)^{2}$.So here:
$[{10/(x^{2}+1})]'=10*[-2x/(x^{2}+1)^{2}]$