daryafoxisdaryafoxis 4)(7√3 + √27)*√3 = (7√3 + 3√3)*3√3 = 10√3*√3 = 10*3 = 30
5) (√75 - √12) * 2√3 = (5√3 - 2√3) * 2√3 = 3√3 * 2√3 = 6*3 = 18
6) (2√5 - √20)*√5 = (2√5 - 2√5)*√5 = 0*√5 = 0