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= (5√3 - 2√5)(20 + √15)
= 100√3 + 5√45 - 40√5 - 2√75
= 100√3 + 5.3√5 - 40√5 - 2 .5√3
= 100√3 + 15√5 - 40√5 - 10√3
= 90√3 - 25√5
d =
=
=
=
= (5√3 - 2√5)(20 + √15)
= 100√3 + 5√45 - 40√5 - 2√75
= 100√3 + 5.3√5 - 40√5 - 2 .5√3
= 100√3 + 15√5 - 40√5 - 10√3
= 90√3 - 25√5