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katovenus [111]
3 years ago
14

How do I solve number 1 ?

Mathematics
2 answers:
nekit [7.7K]3 years ago
6 0

Answer:

D.) 46 + 37i

Step-by-step explanation:

(5 - 4i)(2 + 9i)

use the FOIL method

10 + 45i - 8i + 36

collect like terms

(10 + 36) + (45i - 8i)

simplify

46 + 37i

DochEvi [55]3 years ago
4 0

Step-by-step explanation:

(5−4i)(2+9i)

=(5+−4i)(2+9i)

=(5)(2)+(5)(9i)+(−4i)(2)+(−4i)(9i)

=10+45i−8x−36i2

=−36i2+37i+10

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