Which of the following is not an irrational number $5sqrt5$ , $sqrt2$ , $4sqrt4$ , $4sqrt16$ ?

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Answer 1 · 2015-04-13T13:22:32

Both $sqrt(4)$ and $sqrt(16$ can be written as rational values
$sqrt(4) = 2$
and
$sqrt(16) = 4$
So both $4sqrt(4)$ and $4sqrt(16)$ are rational.

$5sqrt(5)$ and $sqrt(2)$ are both irrational.

Which of the following is not an irrational number 5sqrt55sqrt5, sqrt2sqrt2, 4sqrt44sqrt4, 4sqrt164sqrt16?