Answer:
Step-by-step explanation:
sqrt(80b^2) can be also written as sqrt(16(5)b^2).
The property sqrt(x*y) = sqrt(x) * sqrt(y) allows us to factor out square root of 16. Thus,
sqrt(16) * sqrt(5) * sqrt (b^2)
4*sqrt(5)*sqrt(b^2)
Sqrt(b^2) is the same as b^2/2, so Sqrt(b^2)= b
final answer 4b * sqrt(5)
