Question #189941

Find the equation of a curve in the xy-plane that passes through (1,3) and whose tangent at a point (x,y) has a slope (-6x(2+y))/√(〖3-3x〗^2 )


1
Expert's answer
2021-05-11T11:36:31-0400

Slope at (x,y)


dydx=6x(2+y)(33x)2\dfrac{dy}{dx}=\dfrac{-6x(2+y)}{(3-3x)^2}


Solving above differential equation:

It is first order linear ordinary differential equation

dy(2+y)=6x(33x)2 dy(2+y)=6x(33x)2 lny+2=233x2 +C\dfrac{dy}{(2+y)}=\dfrac{-6x}{(3-3x)^2}\\\ \\\int \dfrac{dy}{(2+y)}=\int \dfrac{-6x}{(3-3x)^2}\\\ \\ln|y+2|=2\sqrt{3-3x^2}\ +C


and the curve passes through (1,3)

lny+2=233x2 +Cln3+2=233(1)2+cln5=C\ln|y+2|=2\sqrt{3-3x^2}\ +C\\\ln|3+2|=2\sqrt{3-3(1)^2}+c\\\ln|5|=C

Hence, C = ln|5|

So putting this value in above equation, we get

lny+2=233x2+ln5y+2=e233x2+ln5y=e233x2+ln52\ln|y+2|=2\sqrt{3-3x^2}+ln5\\y+2=e^{2\sqrt{3-3x^2}+ln5}\\y=e^{2\sqrt{3-3x^2}+ln5}-2


Hence equation of curve = y=e233x2+ln52\boxed{y=e^{2\sqrt{3-3x^2}+ln5}-2}



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