1) 7x + 3x = · (7 + 3)
2) 6x² -11x² = x² · (6 - )
3) 8xy - x²yz + 9xz = · (8y - xyz + 9z)
4) 15x² - 10x = · (3x - 2)
5) 8x² + 2x = · (4x + )
6) a⁵ - 6a² = a² · (a³ - )
7) 18a⁴b - ab = · (18a³ - )
8) a · (x + 2) - b (x + 2) + c· ( x + 2) = () · (a - b + c)
9) 20xy³ - 5x²y = · (4y² - )
10 ) 18r⁶s² - 9r²s⁵ + 3r⁵s⁷ = r²s²· (r⁴ - 3s³ + r³s⁵)