`45, mx(a+b) - m(a+b)`
`= (ab)(mx-m)`
`= mab(x-1)`
`47, a(x-1) + b(1-x)`
`= (a-b)(x-1)`
`49, ab(x-5) - a(5-x)`
`= (ab + a)(x-5)`
`= a(b+1)(x-5)`
`63, x^(m+2) - x^m = x^m(x^2-1) = x^m(x-1)(x+1)`
45) mx(a + b) - m(a + b)
= (a + b)(mx - m)
= m(a + b)(x - 1)
47) a(x - 1) + b(1 - x)
= a(x - 1) - b(x - 1)
= (x - 1)(a - b)
49) ab(x - 5) - a²(5 - x)
= ab(x - 5) + a²(x - 5)
= (x - 5)(ab + a²)
= a(x - 5)(b + a)
63) x^(m + 2) - x^m
= x^m(x² - 1)
= x^m(x - 1)(x + 1)