Solve y′=−2yy' = -2yy′=−2y.
y=Ce−2xy = C e^{-2x}y=Ce−2x
y=−2exy = -2e^xy=−2ex
y=e−2x+Cy = e^{-2x} + Cy=e−2x+C
y=0y = 0y=0