Question

Phân tích đa thức 

x\(^4\)+1

Answer 1

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

Answer 2

\(x^4+1=\left(x^4+2x^2+1\right)-2x^2=\left(x^2+1\right)^2-\left(\sqrt{2}x\right)^2=\left(x^2-\sqrt{2}x+1\right)\left(x^2+\sqrt{2}x+1\right)\)