$(\sqrt{5} + \sqrt{2})(\sqrt{5} - \sqrt{2})$ equals

$(\sqrt{5} + \sqrt{2})(\sqrt{5} - \sqrt{2})$ equals
  1. $3$
  2. $7$
  3. $\sqrt{3}$
  4. $\sqrt{7}$

Solution

$(a+b)(a-b) = a^{2} - b^{2} = 5 - 2 = 3$.

Asked in: MH-SSC-9

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