Posted by erika on .
in 8 years rachel will be twice as old as warren. Today the product of their ages is 384. how old is rachel and how old is warred?

algebra 
drwls,
R + 8 = 2(W + 8)= 2W + 16
R*W = 384
Solve those two equations in two unknowns.
R = 2W + 8
(2W + 8)*W = 384
2W^2 + 8W 384 = 0
W^2 + 4W 192 = 0
(W + 16)(W  12)= 0
W = 12 is the positivevalue solution. Ignore the negative solution.
R = 32