hitunglah A. √27+√81= b. 2√4-6√64+√49=

a)  √27 + √81 = √3² x 3 + √9²
                      = 3√3 + 9
                      = 9 + 3√3

b)  2√4 - 6√64 + √49 = 2(2) - 6(8) + 7
                                 = - 37