Multiple Choice Question (MCQ)

The value of (\sqrt{5}+\sqrt{2} )(\sqrt{5}-\sqrt{2} )

  1. ×

    10

  2. ×

    7

  3. 3

  4. ×

    \sqrt{3}

Collected in the board: Difference of Two Squares

Steven Zheng posted 4 hours ago

Answer

  1. Apply difference of squares formula to the product of conjugates

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

    =(\sqrt{5} )^2-(\sqrt{2} )^2

    =5-2

    =3

Steven Zheng posted 4 hours ago

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