anonymous
  • anonymous
Hey I'm having trouble getting my head around this one could anyone explain how I could evaluate this please :) Let D={(x,y,z) such that z^2=1+x^2+y^2 and 1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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dumbcow
  • dumbcow
this is how i would do it \[1
anonymous
  • anonymous
Thanks very much for the reply, but in your line 4 shouldn't there be an -x^2 on the left of the inequality and if so how would you solve? (I'm not trying to be picky This stuffs driving me up the walls so your help is very much appreciated)
dumbcow
  • dumbcow
no i agree with you, but you cant have a neg inside radical so you have to adjust the min value of y y must be greater than 0 to satisfy 0

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anonymous
  • anonymous
surely y could be less than zero because you are squaring it?
dumbcow
  • dumbcow
ok yeah that won't work, well to satisfy the equation --> 0
anonymous
  • anonymous
What about a change of variables, not sure how we'd manage it but it might make the problem a bit easier? maybe

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