please clear my doubt
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Step-by-step explanation:
x^2+y^2+z^2-100=-2(xy+yz+zx)
x^2+y^2+z^2+2(xy+yz+zx)=100
(x+y+z)^2=100
x+y+z=10
3z+z=10
4z=10
z=2.5
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Answer: Please Find your answer in the img attached
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