Answer: a = 4 and b = sqrt 5 (I cant type the symbol on an IPad sorry)
Step-by-step explanation: 16 times 5 is 80, when you move the 16 out of the square root, it becomes 4 because 4 times 4 is 16. The five can no longer be simplified any further, thus resulting in the simplest form being 4 sqrt 5.