Question

Prove that x^2+y^2+z^2+-xy-yz-zx is always positive.
Please answer as fast as you can.​

Answer 1

Answer:

x^3 + y^3 + z^3 -3xyz= (x+y+z) ( x^2 + y^2 + z^2 - xy- yz - zx)

Step-by-step explanation:

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