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\(3x^4-4x^3+1\)
\(\text{Phân tích thành nhân tử}\)
\(\left(x-1\right)^2\left(3x^2+2x+1\right)\)
k nhé
\(3x^4-4x^3+1\)
\(=\left(3x^4-3x^3\right)-\left(x^3-1\right)\)
\(=3x^3\left(x-1\right)-\left(x-1\right)\left(x^2+x+1\right)\)
\(=\left(x-1\right)\left(3x^3-x^2-x-1\right)\)
\(=1-4x^2-x^3+4x\)
\(=-\left(x-1\right)\left(x^2+x+1\right)-4x\left(x-1\right)\)
\(=\left(x-1\right)\left(-x^2-x-1-4x\right)\)
\(=\left(x-1\right)\left(-x^2-5x-1\right)\)
\(4x^2+2xy+4x+y+1\)
\(=\left(4x^2+2x\right)+\left(2xy+y\right)+\left(2x+1\right)\)
\(=2x\left(2x+1\right)+y\left(2x+1\right)+\left(2x+1\right)\)
\(=\left(2x+y+1\right)\left(2x+1\right)\)
\(x^4+4x^3+2x^2-4x+1\)
\(=x^4+2x^3-x^2+2x^3+4x^2-2x-x^2-2x+1\)
\(=x^2\left(x^2+2x-1\right)+2x\left(x^2+2x-1\right)-\left(x^2+2x-1\right)\)
\(=\left(x^2+2x-1\right)^2\)
\(4.\left(2x+3\right)\left(2x-1\right)\left(x-3\right)\left(4x+1\right)+44x^2\)
\(=4.\left(4x^2+4x-3\right)\left(4x^2-11x-3\right)+44x^2\)
Đặt \(4x^2+4x-3=t\)
\(\Rightarrow4.\left(2x+3\right)\left(2x-1\right)\left(x-3\right)\left(4x+1\right)+44x^2\)
\(=4.t.\left(t-15x\right)+44x^2\)
\(=4t^2-60tx+44x^2\)
\(=4.\left(t^2-15tx+11x^2\right)\)
Tự lm nốt nhé~
\(4x^4+1=\left(2x^2\right)^2+2.2x^2+1-\left(2x\right)^2=\left(2x^2+1\right)^2-\left(2x\right)^2=\left(2x^2-2x+1\right)\left(2x^2+2x+1\right)\)