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Math Help - -3/sqrt(18)==-1/sqrt(2) ?

  1. #1
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    -3/sqrt(18)==-1/sqrt(2) ?

    how come?
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  2. #2
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    \displaystyle -\frac{3}{\sqrt{18}} = -\frac{3}{\sqrt{9\times 2}} = -\frac{3}{\sqrt{9}\sqrt{2}} = -\frac{3}{3\sqrt{2}} = -\frac{1}{\sqrt{2}}.
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  3. #3
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     -3/sqrt(18)=-3/sqrt(9*2)
    now what is  sqrt(a*b)
    can u take it from here??
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