1) a^2b^2 + ab = ab(ab + 1)
2) 3m(a - 3) + n(a - 3) = (a - 3)(3m + n)
3) (5 - b)^2 - 4(b - 5) = (5 - b - 2)(5 - b + 2) = (3 - b)(7 - b)
1) a^2b^2 + ab = ab(ab + 1)
2) 3m(a - 3) + n(a - 3) = (a - 3)(3m + n)
3) (5 - b)^2 - 4(b - 5) = (5 - b - 2)(5 - b + 2) = (3 - b)(7 - b)