Can someone help me with this max and min problem using langarange method?

kathy

New member
The temperature T at a point (x,y,z) on the sphere x^2 +y^2 + z^2 =1 is given by T(x,y,z) = 400xyz^2. What are the maximum and minimum temperatures?



The answer key said the maximum is (1/2, 1/2, sqrt 2 / 2) and min is (1/2, -1/2, sqrt 2 /2) , (-1/2, 1/2 , sqrt of 2 / 2) which both are 50 degree. I'm still confused however
 
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