# How do you evaluate the expression 136 - sqrt57 ?

$136 - \sqrt{57} \approx 128.45$
This expression cannot be simplified any further, as $57$ doesn't have a factor that's a perfect square other than $1$. $3$ and $19$ are not perfect squares.
We can directly take the square root of $57$, however:
$\sqrt{57}$ is approximately $7.55$, and we can subtract this from $136$ to get $128.45 .$NOTE: This is only an approximation.