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
Elden [556K]
3 years ago
9

Please explain this type of problem (1+2i)(1+3i)

Mathematics
1 answer:
zhuklara [117]3 years ago
7 0

Answer:

-5(1-I) is the answer

Step-by-step explanation:

(1+2i)(1+3i)

1(1+3i)+2i(1+3i)

1+3i+2i+6i^2

As i^2=-1

1+5i+6(-1)

1-6+5i

-5+5i

Taking -5 as common

-5(1-i)

I hope this will help you :)

You might be interested in
Solve for x <br>3(x - 2) = 6x - 12<br>​
nalin [4]

Answer:

The answer is 2

Step-by-step explanation:

Here's how I got it:

3(x - 2) = 6x - 12

Multiply 3 times x and 3 times 2, this is what you would get

3x - 6 = 6x - 12

Then, subtract the lowest x with the bigger X, this way you would have x on one side:

3x - 6 = 6x - 12

-3x        -3x

This is what you should have after this:

-6 = 3x - 12

Now, to get the variable (letter that represents a number) by itself, you have to add 12 to both sides like this:

-6 = 3x - 12

+12        +12

You would get this:

6 = 3x

Finally, you have to get x by itself, so you have to divide 3 on both sides like this

6/3 = 3/3 x

That's why, your answer is 2

5 0
3 years ago
Question 3(Multiple Choice Worth 2 points)
zysi [14]

The solution to the equation are 5 or -1 after applying the quadratic formula.

<h3>What is a quadratic equation?</h3>

Any equation of the form \rm ax^2+bx+c=0  where x is variable and a, b, and c are any real numbers where a ≠ 0 is called a quadratic equation.

It is given that:

x² - 4x² - 5 = 0

The above equation is a quadratic equation:

Using the quadratic formula:

\rm  $x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

Plug the values in the formula:

\rm  $x=\dfrac{-(-4)\pm\sqrt{(-4)^2-4(1)(-5)}}{2(1)}$

After solving:

x = 5 or -1

Thus, the solution to the equation is 5 or -1 after applying the quadratic formula.

Learn more about quadratic equations here:

brainly.com/question/17177510

#SPJ1

6 0
1 year ago
Solve for the following word problems
fgiga [73]

Answer:

1. is 275 divided by 5 equals 55 so 55 times 12=660

2. 24 hours in a day that's 6 minutes a day 18 minutes in 72 hours

5 0
2 years ago
Frank gets a pay rise from £120 a week to £135 a week. what fraction of his original pay was his pay rise?
Nady [450]

Answer:

1/8

Step-by-step explanation:

135 is 15 more than 120

15 is 12.5% of 120

0.125 as a fraction is 1/8

Hope this helped!

6 0
2 years ago
There are 5 very different seats in a car. In how many ways can 5 different people be seated in the car for a road trip if only
avanturin [10]

Answer:

48

Step-by-step explanation:

Let A and B be the two people who are able to drive. If A is driving, there are 4! ways to arrange the remaining peoplein the car seats. If B is driving, there are also 4! ways to arrange the remaining people. The number of arrangements 'n' is:

n=2*4!\\n=2*4*3*2*1\\n=48\ ways

They can be arranged in 48 ways.

6 0
3 years ago
Other questions:
  • Help on evaluating expressions
    9·1 answer
  • Tell whether the three-dimensional object has rotational symmetry about a line and/or reflectional symmetry in a plane.
    7·2 answers
  • I WILL MARK BRAINLIEST FOR CORRECT ANSWER! :)
    15·1 answer
  • Which does NOT represent a constant rate of change of 70 miles per hour for a car? Question 4 options: The car travels 245 miles
    5·2 answers
  • The classroom door is7 and a half feet tall. How many inches tall is it?
    14·2 answers
  • Find the equation
    5·1 answer
  • Help me <br> please i will follow
    12·2 answers
  • Which is the best description for the graph?
    5·2 answers
  • Please answer correctly !!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!
    8·1 answer
  • Ted can change an advertisement on a billboard in 5hr. Marie can do the same job in 2hr. How long would it take them if they wor
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!