j: =(x+3)(x+4)
k: =-3x^2+4x-3x+4=(3x-4)(-x-1)
l: =x^2+2x+1-5=(x+1-căn 5)(x+1+căn 5)
m: \(=x^3-x^2-2x^2+2=x^2\left(x-1\right)-2\left(x-1\right)\left(x+1\right)\)
\(=\left(x-1\right)\left(x^2-2x-2\right)\)
n: \(=x^4y^4+64+16x^2y^2-16x^2y^2=\left(x^2y^2+8-4xy\right)\left(x^2y^2+8+4xy\right)\)
q: \(=\left(x^2+5x+4\right)\left(x^2+5x+6\right)-24\)
\(=\left(x^2+5x\right)^2+10\left(x^2+5x\right)\)
\(=x\left(x+5\right)\left(x^2+5x+10\right)\)
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