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Math

posted by on .

How do I figure these 2 out.

Find standard form a +bi

(4 square root -9) ( -3 square root -5)


x^2 -3x+4 evaluated for x=1+i

  • Math - ,

    For the second one i got 1+3i is this correct

  • Math - ,

    4 (-9)^.5 * -3 (-5)^.5

    -12 (45)^.5
    -12 (3*3*5)^.5
    -36 sqrt 5

    (1+i)^2 -3(1+i) + 4
    =
    1 + 2 i - 1 - 3 - 3 i + 4
    =
    (1 -i)

  • Math - ,

    Doesnt i^2 equal -1

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