1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
BARSIC [14]
3 years ago
13

Multiply the following complex numbers:(7-3i)(8 + 4i)​

Mathematics
1 answer:
mel-nik [20]3 years ago
3 0

Answer:

A

Step-by-step explanation:

Noting that i² = - 1

Given

(7 - 3i)(8 + 4i) ← expand factors using FOIL

= 56 + 28i - 24i - 12i²

= 56 + 4i - 12(- 1)

= 56 + 4i + 12

= 68 + 4i → A

You might be interested in
Help me with this thank you
alexgriva [62]
(-36x^4y+144x²y^6) / (-4x²y) = 
36xy*(x³+4xy^5) / (-4x²y) = 
-9*(x³+4xy^5) / x
7 0
3 years ago
If 2x + 5y = 21 and x + y = 3, then what is the solution
Viefleur [7K]
2x+5y=21, x+y=3
y=3-x
2x+5y=21
2x+5(3-x) =21
2x+15-5x=21
2x-5x+15=21
-3x+15=21
-3x=21-15
-x=6/3
-x=2
x=-2

8 0
3 years ago
What is the value of x? 6x−1=4x−5
ch4aika [34]
X=-2
Explanation is I just know the answer
8 0
3 years ago
Read 2 more answers
Please very urgent!!!
OleMash [197]

Answer:

216

Step-by-step explanation:

hindi pa sure pero yan

7 0
3 years ago
The price of an item has dropped to 77$ today. Yersterday it was 140$. Find the percentage decrease.
Yuki888 [10]

Answer: It dropped 55%


Step-by-step explanation: well if you multiply 140x.55 it equals to 77


5 0
3 years ago
Other questions:
  • A bag has 2 blue marbles, 3 red marbles, and 5 white marbles. Which event have a probability greater than 1/5
    6·2 answers
  • Name and describe all the angles in the drawing below
    6·2 answers
  • Which of the following is a PRIME factor of 180? <br> A. 7 <br> B. 4 <br> C. 5 <br> D. 9
    15·2 answers
  • Can you please help me questions 4,6,7,8,9,10,and 11 ASAP.
    13·1 answer
  • -7(8-6p) = -6p-8 I need help!!!!
    7·1 answer
  • 20 sum-points please help thanks
    14·2 answers
  • Find the value of x.
    13·1 answer
  • Please Help! Y equals 6
    13·2 answers
  • In a building there are 14 pillars. The radius of each pillar is 21 cm and height 3.5 m. Find the cost
    15·1 answer
  • When you add the same signs, find the ____ and ____ .
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!