Question

Need help please !!!!!!

Answer 1

A perfect square must be hidden within all of those radicands in order to simplify them down to what the answer is.
`√(192)= √(64*3)= 8√(3)`.
`√(80)= √(16*5)=4 √(5)`.
`√(12288)= √(4096*3)=64 √(3)`. The rules for adding radicals is that the index has to be the same (all of our indexes are 2 since we have square roots), and the radicands have to be the same. In other words, we cannot add the square root of 4 to the square root of 5. They either both have to be 4 or they both have to be 5. So here's what we have thus far:
`8 √(3)+4 √(5)+64 √(3)`. We can add
`8 √(3)` and
`64 √(3)` to get
`72 √(3)`. That means as far as our answer goes, A = 72 and B = 4, or (72, 4), choice a.