Simplify the radical expression by rationalizing the denominator. 9 square root of 25 divided by the square root of 50

(9√25) / √50 = 9*5/√50 now simplify the denominator. √50=√25*√2=5√2

so (9*5) / (5√2) simplifies to 9/√2. To rationalize the denominator multiply both the numerator and the denominator by √2.

9√2 / (√2*√2) = 9√2/2