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5 March, 00:28

Perform the indicated multiplication below. Reduce terms and simplify. Include all of the necessary steps and calculations in your final answer.

(2 + i) (3 - i) (1 + 2i) (1 - i) (3 + i)

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  1. 5 March, 02:09
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    Complex numbers multiplication is commutative.

    so

    given

    = (2+i) (1+2i) * (3-i) (3+i) * (1-i)

    | (2+i) (1+2i) | has 5 as its absolute value and geometrically thinking its argument is pi/2. so

    (2+i) (i+2i) = 5i

    and obviously

    (3+i) (3-i) = 10

    so the answer is

    50i * (1-i) = 50 + 50i

    maybe, I think ...
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