# separatio of variables

solve the initial value problem by separation of variables dy/dx=6x^2y and y(0)=4

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1. ydy=6x^2 dx

y^2/2=2x^3 + C

y(0)=4
16/2=C

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bobpursley
2. dy/y = 6 x^2 dx
ln y = 2 x^3 + c

when x = 0, y = 4
ln 4 = c
so
ln y = 2 x^3 + ln 4

ln (y/4) = 2 x^3

or
y/4 = e^(2x^3)
y = 4 e^(2x^3)

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3. damon is correct, I lost y.

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bobpursley

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