Phân tích thành nhân tử \(4x^4+4x^2y+y^2-4\)
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\(1,=x\left(x^2-2x+1-y^2\right)=x\left[\left(x-1\right)^2-y^2\right]=x\left(x-y-1\right)\left(x+y-1\right)\\ 2,=\left(x+y\right)^3\\ 3,=\left(2y-z\right)\left(4x+7y\right)\\ 4,=\left(x+2\right)^2\\ 5,Sửa:x\left(x-2\right)-x+2=0\\ \Leftrightarrow\left(x-2\right)\left(x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
\(x^4+1\)
\(=x^4+2x^2+1-2x^2\)
\(=\left(x^2+1\right)^2-\left(x\sqrt{2}\right)^2\)
\(=\left(x^2-x\sqrt{2}+1\right)\left(x^2+x\sqrt{2}+1\right)\)
______
\(4x^4y^4+1\)
\(=4x^4y^4+4x^2y^2+1-4x^2y^2\)
\(=\left(2x^2y^2+1\right)^2-\left(2xy\right)^2\)
\(=\left(2x^2y^2-2xy+1\right)\left(2x^2y^2+2xy+1\right)\)
______
\(x^4+3x^2+4\)
\(=x^4+x^3+2x^2-x^3-x^2-2x+2x^2+2x+4\)
\(=\left(x^4+x^3+2x^2\right)-\left(x^3+x^2+2x\right)+\left(2x^2+2x+4\right)\)
\(=x^2\left(x^2+x+2\right)-x\left(x^2+x+2\right)+2\left(x^2+x+2\right)\)
\(=\left(x^2+x+2\right)\left(x^2-x+2\right)\)
______
\(x^2+3xy+2y^2\)
\(=x^2+xy+2xy+2y^2\)
\(=x\left(x+y\right)+2y\left(x+y\right)\)
\(=\left(x+2y\right)\left(x+y\right)\)
\(=4x^4+21x^2y^2+y^4-25x^2y^2\)
\(\left(2x^2+y^2\right)-\left(5xy\right)^2\)
\(\left(2x^2+y^2-5xy\right)\left(2x^2+y^2+5xy\right)\)
=4x4+21x2y2+y4−25x2y2=4x4+21x2y2+y4−25x2y2
(2x2+y2)−(5xy)2(2x2+y2)−(5xy)2
(2x2+y2−5xy)(2x2+y2+5xy)
Lời giải:
$-4x^4+1+2x^2y-y=-(4x^4-1)+(2x^2y-y)$
$=-(2x^2-1)(2x^2+1)+y(2x^2-1)$
$=(2x^2-1)[-(2x^2+1)+y]$
$=(2x^2-1)(y-2x^2-1)$
\(4x^4+4x^2y+y^2-4=\left(2x^2\right)^2+2.2x^2.y+y^2-4=\left(2x^2+y\right)^2-2^2=\)\(\left(2x^2+y-2\right)\left(2x^2+y+2\right)\)
4x4+4x2y+y2-4
=(2x2)2+2*2x2y+y2-4
=(2x2+y)2-22
=(2y2+y+2)(2x2+y-2)