Problem :
Remove the common factors of 25x3 +30x2 - 60x.
5x(5x2 + 6x - 12)
Problem :
Remove the common factors of 120x5 -210x3 +150x4.
30x3(4x2 - 7 + 5x)
Problem :
Remove the common factors of 16xy4 +4x2y3 -12x5y4.
4xy2(4y2 + xy - 3x4y2
Problem :
Remove the common factors of 49x2y2 -70x3y3 +7x5y2.
7x2y2(7 - 10xy + x3)
Problem :
Remove the common factors of 27x12y4z - 27x3y4z2 +27x10y4z - 4x4y5z3.
x3y4z(27x9 -27z + 27x7 -4xyz2)