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==> 4√5 / (3 - √5) x (3 + √5) / (3 + √5)
==> (12√5 + 20) / (9 - 5)
==> (12√5 + 20) / 4
==> 3√5 + 5
==> 5 + 3√5
Jadi, bentuk sederhana nya adalah 5 + 3√5 (pilih opsi C)