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Find a vector function, r(t), that represents the curve of intersection of the two surfaces. the paraboloid z = 9x2 y2 and the parabolic cylinder y = 2x2

Sagot :

The vector function is, r(t) =  [tex]\bold{ < t,2t^2,9t^2+4t^4 > }[/tex]

Given two surfaces for which the vector function corresponding to the intersection of the two need to be found.

First surface is the paraboloid, [tex]z=9x^2+y^2[/tex]

Second equation is of the parabolic cylinder, [tex]y=2x^2[/tex]

Now to find the intersection of these surfaces, we change these equations into its parametrical representations.

Let x = t

Then, from the equation of parabolic cylinder,  [tex]y=2t^2[/tex].

Now substituting x and y into the equation of the paraboloid, we get,

[tex]z=9t^2+(2t^2)^2 = 9t^2+4t^4[/tex]

Now the vector function, r(t) = <x, y, z>

So r(t) = [tex]\bold{ < t,2t^2,9t^2+4t^4 > }[/tex]

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