21. Simplify: (x²+x+1) (x²-x+1)
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Step-by-step explanation:
(x^2+x+1)(x^2-x+1)
={(x^2+1)+x}{(x^2+1)-x}
=(x^2+1)^2-x^2
=x^4+2x^2+1-x^2
=x^4+x^2+1
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