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2sqrt(2) * 3sqrt(3) * 5sqrt(12)

 Mar 17, 2016
 #1
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+5

Simplify the following:
2 sqrt(2)×3 sqrt(3)×5 sqrt(12)

sqrt(12)  =  sqrt(2^2×3)  =  2 sqrt(3):
2 sqrt(2)×3 sqrt(3)×5×2 sqrt(3)

2 sqrt(2)×3 sqrt(3)×5×2 sqrt(3) = 2 sqrt(2)×2×3^(1+1/2+1/2)×5:
2 sqrt(2)×2×3^(1+1/2+1/2)×5

Put 1+1/2+1/2 over the common denominator 2. 1+1/2+1/2  =  2/2+1/2+1/2:
2 sqrt(2)×2×3^2/2+1/2+1/2×5

2/2+1/2+1/2  =  (2+1+1)/2:
2 sqrt(2)×2×3^(2+1+1)/2×5

2+1+1 = 4:
2 sqrt(2)×2×3^(4/2)×5

The gcd of 4 and 2 is 2, so 4/2 = (2×2)/(2×1) = 2/2×2 = 2:
2 sqrt(2)×2×3^2×5

3^2 = 9:
2 sqrt(2)×2×9×5

2×2  =  4:
4×9×5 sqrt(2)

4×9  =  36:
36×5 sqrt(2)

36×5  =  180:
Answer: |  180 sqrt(2)

 Mar 17, 2016
 #2
avatar+128578 
0

2sqrt(2) * 3sqrt(3) * 5sqrt(12)

 

2 √ 2  *  3 √3  * 5 √12      and since we're multiplying....we can switch the order any way we would like......so we have.....

 

[ 2 * 3 * 5  ]   *  [ √2 * √3 * √12 ]

 

[ 30]  *  [ √2 * √3 * √4 * √3 ]

 

[30] * [ √2 * √3 * 2 * √3 ]

 

[30 *2] * [ √3 * √3 * √2 ]

 

60  * [ 3 * √2 ]

 

60 * 3  * √2 

 

180 √2

 

 

 

cool cool cool

 Mar 17, 2016

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