Объяснение:

[tex]k {}^{3} + 2k {}^{2} + k {}^{2} x + 2kx = k\left(k^{2}+2k+kx+2x\right) =k\left(k+2\right)+x\left(k+2\right) =\left(k+2\right)\left(k+x\right) =k\left(k+2\right)\left(x+k\right) [/tex]