1. The problem statement, all variables and given/known data Find a parametric representation for the lower half of the ellipsoid 3x^2 + 5y^2 + z^2 = 1 x=u y=v z=?? we need to find what z is 3. The attempt at a solution i solved the equation for z getting z= sqrt(1-3x^2-5y^2) then i plugged the given x=u and y=v into equation to get z= sqrt(1-3u^2-5v^2) but that is wrong? what should i do instead??