001071376 001071376

25-10-2018
Mathematics

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Which is the product of the following numbers?

−4 (−3 + 9i )( 5 − 6i )

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jimrgrant1 jimrgrant1

25-10-2018

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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