SOLUTION: Please show how to work out: 6 the sq root of 20 plus 8 the sq root of 5 minus 5 the sq root of 45

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Question 264666: Please show how to work out:
6 the sq root of 20 plus 8 the sq root of 5 minus 5 the sq root of 45
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
6sqrt%2820%29+%2B+8sqrt%285%29+-+5sqrt%2845%29
sqrt%2820%29+=+sqrt%284%29%2Asqrt%285%29
sqrt%2845%29+=+sqrt%289%29%2Asqrt%285%29
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6sqrt%2820%29+%2B+8sqrt%285%29+-+5sqrt%2845%29
= 12sqrt%285%29+%2B+8sqrt%285%29+-+15sqrt%285%29
= 5sqrt%285%29