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Math Help - Complex Numbers

  1. #1
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    Question Complex Numbers

    I can factor everything up until i get to the last two terms that require me to multipy the square roots and there after... Thanks in advance for any help!!

    (-5+sqrt(-9)) (7-sqrt(-1))
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  2. #2
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    Quote Originally Posted by tarabshort View Post
    I can factor everything up until i get to the last two terms that require me to multipy the square roots and there after... Thanks in advance for any help!!

    (-5+sqrt(-9)) (7-sqrt(-1))
    (-5 + \sqrt{-9})(7 - \sqrt{-1})

    (-5 + 3i)(7 - i)

    -35 + 5i + 21i - 3i^2

    -35 + 26i + 3

    -32 + 26i
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by tarabshort View Post
    I can factor everything up until i get to the last two terms that require me to multipy the square roots and there after... Thanks in advance for any help!!

    (-5+sqrt(-9)) (7-sqrt(-1))
    Hi tarabshort,

    Here are the steps to multiply these 2 complex expressions:

    (-5+\sqrt{-9})(7-\sqrt{-1}=

    (-5+3i)(7-i)=

    -5(7-i)+3i(7-i)=

    -35+5i+21i-3i^2=

    -35+26i+3=

    -32+26i

    Edit: I'm too slow today, Skeeter. I'm using a dial-up connection.
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