Solving y' = (y+9x)^2: Methods & Solutions

[gikiian]

1. The problem statement:

y' = (y+9x)^2The attempt at a solution

I just need to know how do you bring it into the separable form. Tell me numerically or just in words, I won't mind.
Which method do I need to use?

Thanks

 

[LCKurtz]

Change the dependent variable y to u with the substitution u = y + 9x.