tolong jawab in sebentar di kumpul

2. √2 + √3 - (-2√5 + √3) = √2 + √3 + 2√5 - √3
                                      = √2 + 2√5

3. √8 - 2√27 - 5√54 = √4x2 - 2√9x3 - 5√9x6
                               = 2√2 - 2x3√3 - 5x3√6
                               = 2√2 - 6√3 - 15√6