I fond the ingegrating factor to be 1+x and now I dont know where do to from there
It doesn't help to find the integrating factor if you don't know what an "integrating factor" is! Don't memorize formulas, learn concepts!
An integrating factor for a linear differential equation of the form dy/dx+P(x)y= f(x,y) is a function of x, such that multiplying both sides of the equation by it converts the left side into a "perfect" derivative so that the equation becomes: .
If (1+ x) really is an integrating equation (I haven't checked that) then multiplying 1+x on both sides converts the equation to . Now integrate both sides with respect to x.