Keep this in mind. It's taken from another answer, but describes the situation well.
Consider:
(x-a)(x-b)(x-c)=0
Recall from properties of numbers that if you multiply any quantity by 0 you get 0. So at least one of x-a, x-b, x-c has to be 0 for this to be true. What makes that true? x=a,x=b,x=c!
Also remember FOIL when multiplying two binomials.
a. 1,1 is x=1 and x=1 meaning (x-1)(x-1) or 
b. 0,5,-5 is x=0, x=5 and x=-5 meaning x(x-5)(x+5) = 
c.0,0,0,1 is x=0, x=0, x=0, x=1 meaning x*x*x(x-1) = 
d. 2,2,1,-1 is x=2, x=2, x=1, x=-1 meaning 
If you need help understanding math so you can solve these problems yourself, then one on one online tutoring is the answer ($30/hr). If you need faster solutions with guaranteed detailed answers, then go with personal problem solving ($3.50-$5.50 per problem). Contact me at fcabanski@hotmail.com
(