1. The problem statement, all variables and given/known data y'=-5xy, y=? 3. The attempt at a solution i solved that, dy/dx=-5xy dy/y=-5x dx ∫(1/y)dy=∫-5x dx = ln(lyl)= -2.5x^2+C so, y=+- e^(-2.5x^2+C) =+-K*e^(-2.5x^2) but the answer is y=K*e^(-2.5x^2) how can i understand this? just shoud i ignore "the absolute value"?