Question

If x +y+z=5, and xy + yz + Zx=3
, then
find x2+y2+z2
​

Answer 1

Hope this will helps you
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Answer 2

Answer:

${(x + y + z)}^{2} = {x}^{2} + {y}^{2} + {z}^{2} + 2(xy + yz + zx) \\ replacing \: values \\ {(5)}^{2} = {x}^{2} + {y }^{2} + {z }^{2} + 2(3) \\ \\ 25 = {x}^{2} + {y}^{2} + {z}^{2} + 6 \\ therefore \\ {x}^{2} + {y}^{2} + {z}^{2} \: = 19$