Answer:
3rd Option
Explanation:
Order of Operations: BPEMDAS
When you are multiplying radicals, you multiply the innards while keeping the square root.
Step 1: Write expression
√5(6 - 4√3)
Step 2: Distribute
6(√5) - 4√3(√5)
Step 3: Simplify/Multiply
6√5 - 4√15