Question

How do you evaluate the expression `136 - sqrt57`?

Answer 1

`136-sqrt57~~128.45`

Explanation:

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:
`sqrt57` is approximately `7.55`, and we can subtract this from `136` to get `128.45.`NOTE: This is only an approximation.