\(4x^4+y^4=4x^4+4x^2y^2+y^4-4x^2y^2\)
\(=\left(2x^2+y^2\right)^2-\left(2xy\right)^2\)
\(=\left(2x^2-2xy+y^2\right)\left(2x^2+2xy+y^2\right)\)
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Các câu hỏi tương tự
I: PTĐTTNT
a) x^4+4x^2-5
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I : Tìm x , y
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