Math

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

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asked by lt
  1. For the second one i got 1+3i is this correct

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    posted by lt
  2. 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)

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    posted by Damon
  3. Doesnt i^2 equal -1

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    posted by lt

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