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
slavikrds [6]
4 years ago
10

Evaluate the expression ( 1 + 2 i ) ( − 2 − 1 i ) and write the result in the form a + b i .

Mathematics
1 answer:
Nina [5.8K]4 years ago
6 0

Answer:

- 5i.

Step-by-step explanation:

( 1 + 2 i ) ( − 2 − 1 i )

= 1 * -2 + 1*-1i + 2i*-2 - 2i*1i

= -2 - i - 4i - 2i^2           i^2 = -1 so we have:

-2 - 5i +2

= 0 - 5i

= -5i.

You might be interested in
Is 0.17 less than 0.32
Gre4nikov [31]

Answer:

Yes, If you see the 1st number after the decimal they are 1 and 3. Which is larger? It is 3. So 0.17 is less.

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Please help!!!!! <br><br> What is the measure of P? Round your answer to the nearest degree.
Hoochie [10]
The answer is 42 degrees
7 0
3 years ago
What the answer to 1/3 + (2/3 + 5/8)?
NemiM [27]

exact form : 13/8

decimal: 1.625

mixed number: 1 5/8

8 0
3 years ago
Read 2 more answers
Explain the connection between ∠2 and ∠B. A triangle has angle measures 50 degrees, 65 degrees, and B. 2 lines extend from a hor
Furkat [3]

Since the two angles are equal, hence the angles B and angle 2 are congruent.

<h3>Congruent triangles</h3>

Congruent triangles are triangles that are similar to each other

Since the sum of the interior angles of a triangle is 180°, then

m∠B + 50° + 65° = 180°

Determine the value of <B

m∠B = 180° - (50° + 65°)

m∠B  = 180° - 115°

m∠B= 65°.

Similarly, the sum of angle on a straight line is 180 degrees

m∠2 + 50° + 65° = 180°

m∠2 = 180° - (50° + 65°)

m∠2 = 180° - 115°

m∠2= 65°

As we can see that the two angles are equal, hence the angles B and angle 2 are congruent.

Learn more on congruent angles here; brainly.com/question/2938476

#SPJ1

6 0
3 years ago
Use a table to solve. round to the nearest tenth 2^(8x)=93
lana66690 [7]
I got the decimal form where x= 0.817395
if that's wrong then sorry
7 0
3 years ago
Read 2 more answers
Other questions:
  • Round to the nearest hundredth 5.6192
    11·1 answer
  • If a 4x 16 rectangle has the same area as a square, what is the length of a side of the square?
    15·1 answer
  • Which parabola will have a minimum value vertex?
    11·2 answers
  • A crop initially has N₀ Bacterias. After 1 hour the crop has reached ( 3/2 ) N₀ Bacterias. If the rapid growth in that crop is p
    6·1 answer
  • Concrete workers are busy preparing to pour a rectangular patio on the rear of Miguel's new house. The workers have laid out, us
    14·1 answer
  • What does it mean to solve an equation<br> 1.4y = 3.5
    14·2 answers
  • How should the subject-verb agreement in this sentence be changed, if at all?
    6·1 answer
  • According to Class 8 please solve
    12·2 answers
  • You want to get at least 48 people to your costume party. Your 12 best friends will definitely be there. For every time you twee
    8·1 answer
  • Find 48.9% of 264.Round to the nearest hundredth
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!