You have the following expression:
√2 + √5 + √5
In order to simplify the given expressions, you consider the terms with square roots as factor that you can simplify in the same way of the simplification in algebra. That is, if you have √5 + √5, you can sum the coefficients of these terms. Thus, what you have is √5 + √5 = 2√5.
Then, for the given expression you obtain:
√2 + √5 + √5 = √2 + 2√5