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5. (2√5-3) (2√5+3) = dikalikan kedua-nya
(2√5 x 2√5) (2√5 x 3) (-3 x 2√5) (-3 x 3)
(4.5) (6√5) (-6√5) (-9)
20 + 6√5 - 6√5 - 9
20 -9 = 11
B