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March 26, 2017

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So I need to solve this differential equation

dy/dx = 1/(x+2)

so i solved it like this

dy = 1/(x+2)dx

then i took the integral of both sides

y= ⌠1/(x+2)dx

then performed a u sub

u = x+2

du = 1dx

y = ⌠du/u

y = ln abs(u)+c

y = ln abs(x+2)+c

but the sanswer is supposed to be

y = ln abs ((x+2)/2) + c

Where did I mess up? and where did the 2 in the denominatior of the (x+2) come from?

  • math - ,

    Not sure where the 2 came from, but since

    ln(u/2) = ln(u) - ln(2)

    just fold the ln(2) into the C.

  • math - ,

    okay thank you!

  • math - ,

    i don't know answer.i am tring to find answer

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