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Question Number 143507 by Billy last updated on 15/Jun/21

$$10\sqrt{20}+13\sqrt{45}$$

Answered by qaz last updated on 15/Jun/21

$$10\sqrt{20}+13\sqrt{45}$$$$=10\times 2\sqrt{5}+13\times 3\sqrt{5}$$$$=(20+39)\sqrt{5}$$$$=59\sqrt{5}$$

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