Question

Please help! :(

Which expression is irrational?

A.

`√(1)`

B.

`√(1) √(9)`

C.

`√(25)`

D.

`√(50)`

Answer 1

A.
`√(1)` equals 1 and that is a rational number

B.
`√(1) √(9)` equals 1*3 = 3 and is a rational number

C.
`√(25)` equals 5 and is a rational number

D.
`√(50)` equals 7.07106781187. The number doesn't terminate and so it is irrational.

The answer is D