Question

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6√72 -6√8+√20-3√45

Answer 1

6√72 = 36√2
6√8 = 12√2
√20 = 2√5
3√45 = 9√5

6√72 - 6√8 + √20 - 3√45 = 36√2 - 12√2 + 2√5 - 9√5
= 24√2 - 7√5

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