Answer
To add square roots with the same radicands, add their coefficients (factors outside the radicals) then retain/copy the radical.
Refer to the example below.
Work Step by Step
To add square roots with the same radicands, add their coefficients (factors outside the radicals) then retain the radical.
Example:
$3\sqrt2 + 5\sqrt2 = (3+5)\sqrt2 = 8\sqrt2$