Prove that a^4+b^4+a^2b^2+x^2-xy+y^2+1>0 Help would be appreciated!
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Hey RuyHayabusa. Hint: Try completing the square for the pairs of variables (a,b) and (x,y).
Originally Posted by RuyHayabusa Prove that a^4+b^4+a^2b^2+x^2-xy+y^2+1>0 Help would be appreciated! The statement is not true. For this to be positive, we require . There is no guarantee of this.
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