spndsh
lagrange multipliers: f(x,y,z)= x2y+5z; g(x,y,z)= x^2+y^2+z^2=30



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you found both gradients I assume?

spndsh
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dw:1352428589155:dw

Algebraic!
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\[(\frac{ 1 }{ 2\lambda } )^2 + (\frac{ 1 }{ \lambda } )^2 + (\frac{5 }{ 2\lambda } )^2 =30\]
\[(\frac{ 1 }{ 2} )^2 + (1 )^2 + (\frac{5 }{ 2 } )^2 =30\lambda^2\]

Algebraic!
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\[\lambda = 1/2\]

spndsh
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x= 1 ; y=2 ; z=5 .. how do find the max/mins?