i'm following paul's notes @ Pauls Online Notes : Algebra - Radicals and needless to say i'm starting to get a little confused.
I'm on the example 3c
So because the radical is larger than the index, it must be simplied..got it. i understand that you have to break it down as well. says that we must break them up into perfect squares, which gets this.
Now i'm lost with this. How did the 18 get divided by two?
i understand that the y must be cut as its a multiple of 2, by why did it turn into a 2y? to me it seems like it would of been a y10 y..instead of a y10 (2y). i seem a bit lost on where that 2y comes into play ..or how it came to be. any pointers?