Hi.

first i apologize for my bad english.

I need to solve this equation : ( i have its solution but can't understand some parts of it )

(y(1)^{4}- 3x^{2})dy + xydx = 0

I usey = tــ>^{a}dy = at(2) and place it in (1) :^{a-1}dt

a(t^{5a-1}- 3x^{2}t^{a-1})dt + xt^{a}dx = 0

then i don't understand this next part ( I'm typing it from solution of problem ):5a - 1 = 2 + a - 1 ?it then calculates a = 1/2 and solves the equation ... i don't get why 5a - 1 = 2 + a - 1 ...

thanks in advance.