SOLUTION: simplify 2square root90 - square root of 40

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Question 209577: simplify 2square root90 - square root of 40
Answer by checkley77(12844) About Me  (Show Source):
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2square root90 - square root of 40
2sqrt90-sqrt40=2sqrt(9*10)-sqrt(4*10)=2*3sqrt10-2sqrt10=6sqrt10-2sqrt10=4sqrt10