Evaluate
12\sqrt{10}-\sqrt{30}\approx 32.470106347
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\sqrt{1440}-\sqrt{30}
Multiply 18 and 80 to get 1440.
12\sqrt{10}-\sqrt{30}
Factor 1440=12^{2}\times 10. Rewrite the square root of the product \sqrt{12^{2}\times 10} as the product of square roots \sqrt{12^{2}}\sqrt{10}. Take the square root of 12^{2}.
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