Question

(x^2 +x -1 ) (x^2-x+1)

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Answer 1

(a+b)(a-b)=a^2-b^2
a=x^2
b=x-1
(x^2+x-1)(x^2-(x-1))=(x^2)^2-(x-1)^2=x^4-(x^2-2x+1)=x^4-x^2+2x-1