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Verified answer
12√5 - (7√5 × 4) + 3√125= 12√5 - 28√5 + 3(√25 × √5)
= -16√5 + (3 × 5 × √5)
= -16√5 + 15√5
= -1√5 = -√5
Verified answer
12√5 - (7√5 × 4) + 3√125= 12√5 - 28√5 + 3 × 5√5
= 12√5 - 28√5 + 15√5
= 27√5 - 28√5
= -√5