SOLUTION: HELP! I am new at this square root thing. I am not sure how I enter the 'square root' symbol. I will try putting the sqrt(?) for the symbol ok? I am supposed to multiply and simp

Algebra ->  Square-cubic-other-roots -> SOLUTION: HELP! I am new at this square root thing. I am not sure how I enter the 'square root' symbol. I will try putting the sqrt(?) for the symbol ok? I am supposed to multiply and simp      Log On


   

Question 229000: HELP! I am new at this square root thing. I am not sure how I enter the 'square root' symbol. I will try putting the sqrt(?) for the symbol ok?
I am supposed to multiply and simplify my answer as much as possible.
(3sqrt(?)5-8sqrt(?)3)(8sqrt(?)3-6sqrt(?)5)
Does this make any sense to anyone at all, I really need help with these please??!!!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
%283%2Asqrt%285%29+-+8%2Asqrt%283%29%29%2A%288%2Asqrt%283%29+-+6%2Asqrt%285%29%29
Are you familiar with FOIL method? It basically says:
%28a+%2B+b%29%2A%28c+%2B+d%29+=+ac+%2B+bc+%2B+ad+%2B+bd

What you needto know here is
sqrt%28a%29%2Asqrt%28b%29+=+sqrt%28ab%29
24%2Asqrt%2815%29+-+64%2Asqrt%289%29+-+18%2Asqrt%2825%29+%2B+48%2Asqrt%2815%29
24%2Asqrt%2815%29+-+64%2A3+-+18%2A5+%2B+48%2Asqrt%2815%29
72%2Asqrt%2815%29+-+192+-+90
72%2Asqrt%2815%29+-+282 answer