can someone tell me how 2x3+ 3squared + 2x3squared + 1 is 7+3x3squared? the only part i dont understand is where my book got the 3 from i thought it should be 7+2x3squared?
All they are doing is pretty much using the FOIL method, first let
This can be re written as : by filling in x's for all square root 3's. now just FOIL that and you will get: combine like terms giving you: now fill in for all the x's which gives you Then once you simplify that, you get