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Verified answer
Mapel : MatematikaKelas : IX SMP
Bab : Akar pangkat
Pembahasan :
12√5 - 7√5 x 4 + 3√125
= 12√5 - 28√5 + 3√[25.5]
= 12√5 - 28√5 + 15√5
= (12 - 28 + 15)√5
= - √5