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18. What is the product of (6 + 5i) and (3 - 7i) ?

A: 53+27i
B: - 17 - 27i
C: -17+27i
D: 53 - 27i

19. Which is equivalent to (1 - 14i)(5 - 3i) ?

A: 50 – 70i +42i2
B: -37 - 73i
C: 47+ 3i
D: 5+42i2

Respuesta :

webbmayci
18. Is D 19. Is B
Hope this helps

Explanation
So for 18 you use FOIL
(6+5i)(3-7i)
18-42i+15i-35i^2 i^2=-1
18-27i-(35)(-1)
substitute -1 in and add like terms
53-27i

Then for 19
(1-14i)(5-3i)
5-3i-70i+42i^2
5-73i+(42)(-1)
-37-73i

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