(6 times square root of 3 + square root of 5)(square root of 3 - 4 times the squae root of 5)

Answer 1

I'm assuming your problem is this:

(6√3 + √5)(√3 - 4√5)

Multiplying:

6√9 - 24√15 + √15 - 4√25

I'll let you take it from here to combine like terms and simplify.

I hope this helps and is what you were asking.