If x+y+z =10, xy+yz+zx=-15, xyz=-12 find the value of x ²+y²+z²and x³+y³+z³=?
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x^2 + y^2 + z^2
( x + y + z )^2 = x^2 + y^2 + z^2 + 2 ( xy + yz + xz )
( 10 )^2 = x^2 + y^2 + z^2 + 2 ( - 15 )
100 = x^2 + y^2 + z^2 - 30
x^2 + y^2 + z^2 = 130
( x + y + z )^2 = x^2 + y^2 + z^2 + 2 ( xy + yz + xz )
( 10 )^2 = x^2 + y^2 + z^2 + 2 ( - 15 )
100 = x^2 + y^2 + z^2 - 30
x^2 + y^2 + z^2 = 130
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0
This the solution but I don't know the 2nd part
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