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
RUDIKE [14]
3 years ago
11

Which pair of complex numbers has a real-number product? (1 + 2i)(8i) (1 + 2i)(2 – 5i) (1 + 2i)(1 – 2i) (1 + 2i)(4i)

Mathematics
2 answers:
kupik [55]3 years ago
5 0

Answer:

(1+2i)(1-2i)

Step-by-step explanation:


vlabodo [156]3 years ago
5 0

Answer:

(1+2i)(1-2i)

Step-by-step explanation:

Following are the pairs of the complex number:

(1+2i)(8i),

(1 + 2i)(2 – 5i)

(1+2i)(1-2i) and (1+2i)(4i)

We have to check which pair out of these is a real number product, which means which pair do not contain terms consisting of "i".

A. (1+2i)(8i)= 8i+16i^{2}

                        =8i-16

B. (1+2i)(2-5i)=2-i-10i^{2}

                           =12-i

C. (1+2i)(1-2i)=1^{2}-4i^{2}

                          =5

D. (1+2i)(4i)=4i+8i^{2}

                        =4i-8

Since, A,B,D contains the term "i" which means they are not real valued, therefore option C that is (1+2i)(1-2i) has a real number product.

You might be interested in
What is the total cost of a $2,099 couch including the 6.5% sales tax?​
fomenos

Answer:

$2422

Step-by-step explanation:

2099/6.5=322.923076923 (were rounding that to 323)

so 2099+323=2422

8 0
3 years ago
Read 2 more answers
The graph shows the relationship between the cost of making cardboard boxes and the number of boxes made , what rate does the po
Digiron [165]
The Answer is A because 7 is in the $ side and 35 in the boxes.

$7 / 35 boxes.
5 0
3 years ago
Brandon is training for 200 meter dash. His best running time so far was 31.25 seconds. If Brandon wants to run the dash in 27 s
raketka [301]

Just subtract 27 from 31.25

31.25-27=4.25

Brandon must cut 4.25 seconds

3 0
2 years ago
Read 2 more answers
3 1/4 - 1 7/8 as a mixed number
dimaraw [331]

Hello there,

3 1/4 - 1 7/8 as a mixed number

Answer: 1\frac{3}{8}

3 0
3 years ago
Read 2 more answers
Please help i am stuck
balu736 [363]

Explanation:

All of these are done the same way.

1. Set your compass to a distance slightly longer than the distance from the point to the line you want the perpendicular to.

2. Using the point as a center, draw an arc that intersects the line in 2 places. Consider those points to be "P" and "Q".

3. You can leave the compass as is, or set it to any other distance longer than half the distance between P and Q. Using this radius, and using P and Q as centers, draw intersecting arcs on the other side of the line from the original point. Consider the intersection of those arcs to be point "R".

4. A line through the original point and point R will be perpendicular to the line, as you want.

_____

In problem 1, the point and line are obvious.

In problem 2, the point is the vertex opposite the line of interest. (There will be 3 similar constructions.)

6 0
2 years ago
Other questions:
  • I don't get this please help me
    9·2 answers
  • If MO = 7x - 4, and NO = 6x, what is the length of line MN?
    10·1 answer
  • Determine whether it is a function or not. Give reason for your answer.
    6·1 answer
  • What ratio is equivalent to 6 to 2? Complete the statement.
    6·1 answer
  • Find the value of x in 2(x+1)=4​
    9·2 answers
  • 3x + y = 6<br> What is the answer in standard form
    13·1 answer
  • Find the area of the polygon:
    13·1 answer
  • Brandi sells 20 cookies for $10.00. How much money will she make if she sells 72 cookies?
    8·1 answer
  • Can you help me please I’ll give brainliest
    11·1 answer
  • *GEOMETRY*please help me find the surface area of the solid along with the volume of it step by step!
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!