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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

Rationalize: 42\dfrac{4}{\sqrt{2}}.

  • A

    2\sqrt{2}

  • B

    424\sqrt{2}

  • C

    222\sqrt{2}

    check_circle
  • D

    22

Explanation

42⋅22=422=22\dfrac{4}{\sqrt{2}} \cdot \dfrac{\sqrt{2}}{\sqrt{2}} = \dfrac{4\sqrt{2}}{2} = 2\sqrt{2}.

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