Evaluate
18\left(\sqrt{7}-\sqrt{5}\right)\approx 7.374300004
Factor
18 {(\sqrt{7} - \sqrt{5})} = 7.374300004
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3\left(\sqrt{7}-\sqrt{5}\right)\times 6
Add 4 and 2 to get 6.
18\left(\sqrt{7}-\sqrt{5}\right)
Multiply 3 and 6 to get 18.
18\sqrt{7}-18\sqrt{5}
Use the distributive property to multiply 18 by \sqrt{7}-\sqrt{5}.
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