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Math Help - simplify radical

  1. #1
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    Cool simplify radical

    (-1 minus √-80) minus (3 + √-20)
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  2. #2
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    Quote Originally Posted by blame_canada100 View Post
    (-1 minus √-80) minus (3 + √-20)
     (-1 - \sqrt{-80}) - (3 + \sqrt{-20}) = (-1 - i\sqrt{80}) - (3 + i\sqrt{20})

     = (-1 - i4\sqrt{5}) - (3 + i2\sqrt{5})

     = -1 - 3 - i4\sqrt{5} - i2\sqrt{5}

     = -4 - i6\sqrt{5}
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