Test Mode
Reading Mode
Right = 0
Wrong = 0
(a - 1)(a + b)
(a - 1)(a + 2b + 1)
(a + 1) (a + 2b)
(a + 1) (a + 2b + 1)
(a - 1)(a + 4)
(a - 1)(a - 4)
(a + 1)(a - 4)
(a + 1) (a + 4)
3(y + 2)(y - 2)
6x(y + 2)(y - 2)
6(y + 2)(y - 2)
6x(y + 4)(y - 4)