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sqrt(50) = sqrt(25 x 2) = sqrt(25) x sqrt(2) = 5 sqrt(2) sqrt(18) = sqrt(9 x 2) = sqrt(9) x sqrt(2) = 3 sqrt(2) sqrt(50) - sqrt(18) = 5 sqrt(2) - 3 sqrt(2) = (5 - 3) sqrt(2) = 2 sqrt(2)
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√50 = 5√2
√18 = 3√2
√50 - √18 = 2√2
5 times the square root of two over 3 times the square root of two equals 5/3
2.82842712
sqrt(800) + sqrt(50) - sqrt(18) = 31.113 approximately.
Expressed as a surd, sqrt(40) x sqrt(50) = 20 sqrt(5).
11.3137