Which is the product of the following numbers? −4 (−3 + 9i )( 5 − 6i )

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Which is the product of the following numbers?

−4 (−3 + 9i )( 5 − 6i )

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    2021-10-16T18:54:07+00:00

    expand (- 3 + 9i )(5 – 6i ) using the FOIL method

    = – 4 (- 15 + 18i + 45i – 54i² ) → i² = (√- 1 )² = – 1

    = – 4 (- 15 +63i + 54 )

    = – 4 (39 + 63i ) ( distribute by – 4 )

    = – 156 – 252i ← in standard form

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