Friday, August 7, 2009

`dy/dx = 5 - 8x` Solve the differential equation

`(dy)/dx=5-8x`


This differential equation is separable since it has a form



  • `N(y) (dy)/dx=M(x)`

And, it can be re-written as



  • `N(y) dy = M(x) dx`

So separating the variables, the equation becomes


`dy=(5-8x)dx`


Integrating both sides, it result to


`int dy = int (5-8x)dx`


`y + C_1 = 5x - (8x^2)/2 + C_2`


`y+ C_1 = 5x - 4x^2 + C_2`


Isolating the y, it becomes


`y = 5x - 4x^2 + C_2 -C_1`


Since C2 and C1 are constants, it can be expressed as a single constant C.


`y=5x-4x^2+C`


`y=-4x^2 + 5x + C`


Therefore, the general solution of the given differential equation is `y=-4x^2 + 5x + C` .

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