15/(2√3) = (15*2√3)/(2√3*2√3) = (30√3)/(12) = (5√3)/2
4/(√7-√5) = (4(√7+√5))/((√7-√5)(√7+√5)) = (4(√7+√5))/2 = ((4√7+4√5))/2 = (2(2√7+2√5))/2 = 2√7+2√5
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15/(2√3) = (15*2√3)/(2√3*2√3) = (30√3)/(12) = (5√3)/2
4/(√7-√5) = (4(√7+√5))/((√7-√5)(√7+√5)) = (4(√7+√5))/2 = ((4√7+4√5))/2 = (2(2√7+2√5))/2 = 2√7+2√5