How do you multiply #(4sqrt5 + 3sqrt5)(2sqrt5 - 4sqrt2)#?
1 Answer
Oct 8, 2015
The same way you would multiply non-radicals. Break it down into simpler steps.
The front numbers multiply, then the outer, then the inner, then the last numbers. You might have learned this as "FOIL".
Alternatively you could write this as: