posted by JOSHI .
1. use the factor theorem
looking at 24, I tried ±1, ±2, ...
and found that x=-1 and x=-2 worked
so I used synthetic division consecutively and found
= (x+1)(x+2)(x^2 + 7x + 12)
and the quadratic factors again, so the final factors are
2. already fully factored
3. (a+b)^3 - a - b
= (a+b)^3 - (a+b)
= (a+b)( (a+b)^2 - 1) , last part is difference of squares