(4 sqrt3+5sqrt 2)/(sqrt48 +sqrt18) (5 +sqrt3)/(7-4 sqrt3)
= (4 √3+5√2)/(4√3 +3√2) * (4√3 -3√2)(4√3 -3√2) = (48 - 12√6 + 20√3 - 30)/(48 - 18) = (18 + 8√6)/30 do the second one in the same way. multiply top and bottom by 7 + 4√3
You can ask a new question or answer this question.