phân tích đa thức thành nhân tử 4x(x – 2y) – 5(2y – x)
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\(1,=x\left(x^2-2x+1-y^2\right)=x\left[\left(x-1\right)^2-y^2\right]=x\left(x-y-1\right)\left(x+y-1\right)\\ 2,=\left(x+y\right)^3\\ 3,=\left(2y-z\right)\left(4x+7y\right)\\ 4,=\left(x+2\right)^2\\ 5,Sửa:x\left(x-2\right)-x+2=0\\ \Leftrightarrow\left(x-2\right)\left(x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)
Ta có:\(4x\left(x-2y\right)-8y\left(x-2y\right)\)
\(=\left(x-2y\right)\left(4x-8y\right)\)
\(=\left(x-2y\right)4\left(x-2y\right)\)
\(=\left(x-2y\right)^2.4\)
\(4x\left(x-2y\right)+8y\left(2y-x\right)\)
\(=4x\left(x-2y\right)-8\left(x-2y\right)\)
\(=\left(4x-8\right)\left(x-2y\right)\)
\(=4\left(x-2\right)\left(x-2y\right)\)
a: \(2y\left(x+2\right)-3x-6\)
\(=2y\left(x+2\right)-3\left(x+2\right)\)
\(=\left(x+2\right)\left(2y-3\right)\)
b: \(3\left(x+4\right)-x^2-4x\)
\(=3\left(x+4\right)-\left(x^2+4x\right)\)
\(=3\left(x+4\right)-x\left(x+4\right)\)
\(=\left(x+4\right)\left(3-x\right)\)
c: \(2\left(x+5\right)-x^2-4x\)
\(=2x+10-x^2-4x\)
\(=-x^2-2x+10\)
\(=-x^2-2x-1+11\)
\(=11-\left(x^2+2x+1\right)\)
\(=11-\left(x+1\right)^2\)
\(=\left(\sqrt{11}-x-1\right)\left(\sqrt{11}+x+1\right)\)
d: \(x^2+6x-3x-18\)
\(=\left(x^2+6x\right)-\left(3x+18\right)\)
\(=x\left(x+6\right)-3\left(x+6\right)\)
\(=\left(x+6\right)\left(x-3\right)\)
\(x^6y+4x^2y\)
\(=x^2y\left(x^4+4\right)\)
\(=x^2y\left(x^2-2x+2\right)\left(x^2+2x+2\right)\)
\(x^7y+x^5y+x^3y\)
\(=x^3y\left(x^4+x^2+1\right)\)
\(=x^3y\left(x^2-x+1\right)\left(x^2+x+1\right)\)
4x(x - 2y) - 5(2y - x)
= 4x(x - 2y) + 5(x - 2y)
= (x - 2y)(4x + 5)