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If (x + y + z) = 9 and (xy + yz + zx) = 26 then find the value of x^2 + y^2 + z^2.

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If (x + y + z) = 9 and (xy + yz + zx) = 26 then find the value of x2 + y2 + z2.

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(x + y + z) = 9 and (xy + yz + zx) = 26 

x2 + y2 + z2 = (x + y + z)2 – 2(xy + yz + zx) 

= 92 – 2 x 26 = 81 – 52 = 29

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