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\(x^4+2x^3-4x-4\)
\(=x^4+2x^3-4x-4+2x^2-2x^2\)
\(=\left(x^4-2x^2\right)+\left(2x^3-4x\right)+\left(2x^2-4\right)\)
\(=x^2\left(x^2-2\right)+2x\left(x^2-2\right)+2\left(x^2-2\right)\)
\(=\left(x^2+2x+2\right)\left(x^2-2\right)\)
\(=\left(x^2+2x+2\right)\left(x-\sqrt{2}\right)\left(x+\sqrt{2}\right)\)
\(x^4-2x^3+2x-1\)
\(=\left(x^4-3x^3+3x^2-x\right)+\left(x^3-3x^2+3x-1\right)\)
\(=x\left(x-1\right)^3+\left(x-1\right)^3\)
\(=\left(x+1\right)\left(x-1\right)^3\)
4x4 + 4x3 + 5x2 + 2x +1
= (4x4 + 4x3 + x2 ) + ( 2x2 + 1 ) + 1
= x2(2x + 1 )2 + 2x(2x + 1) +1
= (x(2x + 1 ) + 1)2
= (2x + x + 1)2
4x4+4x3+5x2+2x+1
=(4x4+4x3+x2) + (2x2+1) +1
= x2(2x+1)2 + 2x(2x+1) +1
= (x(2x+1)+1)2
=(2x2+x+1)2
\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
\(4.\left(2x+3\right)\left(2x-1\right)\left(x-3\right)\left(4x+1\right)+44x^2\)
\(=4.\left(4x^2+4x-3\right)\left(4x^2-11x-3\right)+44x^2\)
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~