$7\sqrt{5} - 2\sqrt{5}$ equals

$7\sqrt{5} - 2\sqrt{5}$ equals
  1. $5\sqrt{5}$
  2. $5$
  3. $5\sqrt{0}$
  4. $9\sqrt{5}$

Solution

$(7-2)\sqrt{5} = 5\sqrt{5}$.

Asked in: MH-SSC-9

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