What is the sum of the complex numbers 2 + 4i,and 3 − 7i, where i=-1

Mathematics

2 answers:

Elodia [21]2 years ago

5 0

Answer:

5 - 3i.

Step-by-step explanation:

2 + 4i + 3 - 7i Bring like terms together:

= 2 + 3 + 4i - 71

= 5 - 3i.

Ket [755]2 years ago

4 0

Answer:

5 - 3i

Step-by-step explanation:

Real numbers are a subset of the complex numbers. Therefore it would only make sense that the complex numbers follow the same rule of additivity and multiplication as real numbers do:

$(2+4i)+(3-7i)=2+3+4i-7i=5-3i$

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4. Kay and Allen sell cell phones. Last month Kay sold 17 more cell phones than Allen. Together they both sold 117 cell phones.

forsale [732]

Answer:

Allen sold 50 cell phones while Kay sold 67 cell phones.

Step-by-step explanation:

Let the number of cell phones sold by Allen be x. This will imply that the number of cell phones sold by Kay is x + 17.

Furthermore, we are informed that together they sold a total of 117 cell phones. Therefore, we use the following equation to determine the number of cell phones sold by each;

x + x + 17 = 117

2x + 17 = 117

2x = 100

x = 50

Therefore, Allen sold 50 cell phones while Kay sold 67 cell phones.

7 0

3 years ago

Read 2 more answers

If a = 9 then 4a +7=

Masteriza [31]

The answer is 43 hope this helps:)

6 0