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maksim [4K]
3 years ago
11

Find the product of the complex numbers (-5+ 8i) and (3 - 8i)

Mathematics
1 answer:
Liula [17]3 years ago
7 0

Answer: 49+64i

Step-by-step explanation:

Concept to know:

i=√-1

i²=-1

i³=-i

i^{4}=1

-------------------------------------

 (-5+8i)(3-8i)

=-15+40i+24i-64i²

=-15+64i-64i²

=-15+64i+64  (remember, i²=-1)

=49+64i

Hope this helps!! :)

Please let me know if you have any question or need further explanation

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astraxan [27]

Answer:

30 each of 23% bars and 18 each of 79% bars

Step-by-step explanation:

If x is the number of 1 kg 23% copper bars, and y is the number of 1 kg 79% copper bars, then:

x + y = 48

0.23x + 0.79y = 0.44(48)

Substituting and solving:

0.23x + 0.79(48-x) = 0.44(48)

0.23x + 37.92 - 0.79x = 21.12

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You need 30 each of 23% bars and 18 each of 79% bars.

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3 years ago
The cost of 8 kg of butter is $ 904. what will be the cost of 14 kg of butter
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Answer:

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