x^2+y^2+z^2-xy -yz-zx is always positive
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Show that the function
z=2x2+y2+2xy−2x+2y+2
is greater than −3
I tried to factorize but couldn't get more than (x−1)2+(x+y)2+(y−1)2−(y)2.
Is there any another way to factorize or another method??
z=2x2+y2+2xy−2x+2y+2
is greater than −3
I tried to factorize but couldn't get more than (x−1)2+(x+y)2+(y−1)2−(y)2.
Is there any another way to factorize or another method??
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I don't understand
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