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
lisov135 [29]
3 years ago
13

Given 2x^2=-8, x is A.-2 B. 2 C. 2i or -2i D. 4i or -4i

Mathematics
2 answers:
leonid [27]3 years ago
7 0
<h2>Answer:</h2>

The value of x is \bold{\pm 2 i}

<h2>Given: </h2>

2 x^{2}=-8

<h2>Solution: </h2>

In this problem, we need to find the variable ‘x’ where the value of the x will change according to the conditions provided in the problem. The value of the variable of determined with the help of the constants whose values never change.

Now, in the given problem, we have to bring the constants on one side and variable on one side.

So, on bring the 2 to denominator,

\Rightarrow x^{2}=-\frac{8}{2}

\Rightarrow x^{2}=-4

On taking square root,

\Rightarrow x=\sqrt{-4}

Since, the square is always positive, we cannot get a number with negative sign as a square. So, the square root of the negative number becomes an imaginary number because that number doesn't exist.

\Rightarrow x=\sqrt{(-1) \times 4}

\therefore x=\pm 2 i

Lera25 [3.4K]3 years ago
4 0

Answer:

2i or -2i

Step-by-step explanation:

2x² = -8     First, clear x.

x² = -8/2    Solve

x² = -4        Now, eliminate the square of x by solving the square root of -4.

x = √-4

x = 2i or -2i Is an imaginary number.

You might be interested in
Which expression uses the associative property to make it easier to evaluate? (50points)
Naily [24]

The correct answer is option 4: (8.\frac{1}{4}).\frac{3}{5}

Step-by-step explanation:

Given expression is:

8.(\frac{1}{4}.\frac{3}{5})

The associative property states that for any three terms that are being multiplied, different order of multiplication (i.e. which two terms are multiplied first) will give the same answer.

Let a,b and c be the three terms

then

a.(b.c) = (a.b).c

So applying the associative property on given expression

8.(\frac{1}{4}.\frac{3}{5}) = (8.\frac{1}{4}).\frac{3}{5}

Hence,

The correct answer is option 4: (8.\frac{1}{4}).\frac{3}{5}

Keywords: Associative property, Properties

Learn more about associative property at:

  • brainly.com/question/9729310
  • brainly.com/question/9738996

#learnwithBrainly

5 0
3 years ago
For an independent-measures anova comparing four treatment conditions, dfbetween = 3.
Tanya [424]
<span>For an independent-measures anova comparing four treatment conditions, dfbetween = 3.

TRUE.

The dfbetween is given by the number of treatments minus 1.
</span>
3 0
3 years ago
Aidan writes numbers on his ten fingers as 5, 7, 9, 11, 13, 15, 16, 19, 22, 23. What is the probability of picking an even numbe
faltersainse [42]
It would be 2/10, or 1/5, since two out of the 10 numbers are even. 2/10 simplifies to 1/5, since there is 1 for every 5 numbers.

We could turn this into a percentage by dividing 1 by 5, which gives us 0.2. Then we can multiply by 100 to get 20.

So, our probability of choosing an even number is:
2/10
OR
1/5
OR
20%

Hope I could help!
6 0
3 years ago
Read 2 more answers
What is the least common multiple of both 9 and 12
Crank
LCM is found by finding the factors of both and making sure that both are inthere
9=3 times 3
12=2 times 2 times 3
common one is 3
so we have to have at least 2 threes and 2 twos
2 times 2 times 3 tiimes 3=36
answer is 36
3 0
3 years ago
Read 2 more answers
Which expression can be used to find the product of 720?
Flauer [41]

Answer:

(8 x 9) x (2 x 5) is the correct answer.

Step-by-step explanation:

(8 x 9)= 72

(2 x 5)= 10

72 x 10 = 720

8 0
3 years ago
Other questions:
  • Graph the following line by plotting the x and y intercepts: 5x – 3y = 15. SEE ATTACHMENT
    9·1 answer
  • 5. Find the value of x.<br>12x + 19 22x9<br>.<br>x<br>=​
    14·1 answer
  • What is an equation of a line that passes through the point (10,5) and is perpendicular to the line whose equation is y=5/4x-2?
    8·1 answer
  • Find the total?<br><br>25% of what number is 15?____.
    14·1 answer
  • Change ratio to actual numbers
    11·2 answers
  • John are a snack with 80.79 total calories. If the chips he ate were 43.39 calories, how many calories were in the rest of his s
    6·1 answer
  • What is a set ? Give an example of a set .​
    8·1 answer
  • A survey of 120 teachers determined the following:
    10·1 answer
  • Write an algebraic expression for the word phrase: the quotient of r and 12. Or. 12 O p=12 Or- 12 h Ort 12​
    11·1 answer
  • PLEASE THIS WAS DUE 2 WEEKS AGO I NEED HELP
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!