Câu f không thấy ẩn x nên không phân tích được nha, bạn thông cảm 
g)\(\left(4x^2+8x+4\right)-x^2\)
\(=3x^2+8x+4\)
\(=3x^2+2x+6x+4\)
\(=x\left(3x+2\right)+2\left(3x+2\right)\)
\(=\left(x+2\right)\left(3x+2\right)\)
h)\(\left(3x^2+12x+12\right)-\left(4x+8\right)\)
\(=3\left(x^2+4x+4\right)-4\left(x+2\right)\)
\(=3\left(x+2\right)^2-4\left(x+2\right)\)
\(=\left(x+2\right)\left[3\left(x+2\right)-4\right]\)
\(=\left(x+2\right)\left(3x+2\right)\)
i)\(2x^2-5xy+2y^2\)
\(=2x^2-xy+2y^2-4xy\)
\(=x\left(2x-y\right)-2y\left(2x-y\right)\)
\(=\left(x-2y\right)\left(2x-y\right)\)
k)\(x^4+4\)
\(=x^4+4x^2+4-4x^2\)
\(=\left(x^2+2\right)^2-\left(2x\right)^2\)
\(=\left(x^2+2+2x\right)\left(x^2+2-2x\right)\)
