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Math Help - Complex Numbers

  1. #1
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    Question Complex Numbers

    1) Find the sum of ix^2-(2+3i)x+2 and 4x^2+(5+2i)x-4i

    2) Simplify [(3+i)x^2-ix+4+i] - [(-2+3i)x^2+(1-2i)x-3]

    Any help would be appreciated, thanks in advance.
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  2. #2
    MHF Contributor kalagota's Avatar
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    Quote Originally Posted by trancefanatic View Post
    1) Find the sum of ix^2-(2+3i)x+2 and 4x^2+(5+2i)x-4i

    2) Simplify [(3+i)x^2-ix+4+i] - [(-2+3i)x^2+(1-2i)x-3]

    Any help would be appreciated, thanks in advance.
    1) sum of
    ix^2 - (2+3i)x + 2 and 4x^2+(5+2i)x-4i

    = (4+i)x^2 + (3-i)x + (2-4i)

    2) simplify
    [(3+i)x^2 - ix + 4+i]-[(-2+3i)x^2 + (1-2i)x - 3]

    = (5-2i)x^2 + (-1+i)x +7+i
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  3. #3
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    Thank you for the answers, but I'm not sure how you got that answer. I'm looking for procedures because I'm still unsure on how to start...
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  4. #4
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    Quote Originally Posted by trancefanatic View Post
    I'm looking for procedures because I'm still unsure on how to start...
    Do you know how to add \left[ {4x^2  - 3x + 1} \right] + \left[ {x^2  + 5x - 2} \right]?

    Do you know how to add \left( {3 - 4i} \right) + (2 + 6i) - (1 - 3i)?

    If so just combine the two ideas. Add "like terms"!
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