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
marissa [1.9K]
3 years ago
8

What are the solutions of x^2 - 4 = 0

Mathematics
2 answers:
diamong [38]3 years ago
7 0

It is a difference of squares, so we can factor this to

(x+2)(x-2)=0

Then, we can solve for x.

x=-2,2

Hope this helps.

頑張って!

Gennadij [26K]3 years ago
7 0

Answer:

x = ± 2 i

Step-by-step explanation:

Explanation:

x

2

+

4

=

0

 

subtract 4 on both sides to get

x

2

=

−

4

 

Take the square root of both sides to get

x

=

±

2

i

You might be interested in
Solve the equation by factoring x^2 +5x + 6
vlada-n [284]

Answer:

(x+2) (x+3)

Step-by-step explanation:

6 0
3 years ago
Ben scores 56 out of 79 marks in a maths test.
sesenic [268]
Answer: 70.8%

56 divided by 79= 0.708
0.708x100=70.8
4 0
3 years ago
What is 3 tenths greater than 80%
elena-14-01-66 [18.8K]

we know that


3 tenths is equal to

\frac{3}{10} =0.30


80% is equal to

\frac{80}{100} =0.80

so


3 tenths greater than80% is equal to add

0.30+0.80=1.10

therefore


the answer is

1.10

6 0
3 years ago
Read 2 more answers
Amy had $28 dollar’s to spend on school supplies. After buying 7 pens, she had $20.30 left. How much did each pen cost including
Airida [17]

Answer:

Step-by-step explanation:

If Amy started with 28 dollars and bought 7 pens, then had 20.30 dollars, we can subtract to find the price of all 7 pens.

28-20.30=7.70 dollars

now to find the amount for EACH pen, we divide by 7

7.70/7=1.1

each pen costed Amy 1 dollar and 10 cents with tax

5 0
3 years ago
Read 2 more answers
20. The H.M. between 2 and 8 is<br>(1 marks )​
e-lub [12.9K]

Answer as an improper fraction = 16/5

Answer as a mixed number = 3 & 1/5

Answer in decimal form = 3.2

All of those values represent the same thing, but written in a different way.

=============================================================

Explanation:

I'm assuming HM stands for Harmonic Mean in this case.

If so, then we apply the reciprocal operation to each value to get 1/2 and 1/8 (from 2 and 8 respectively).

Add up those fractions:

1/2 + 1/8 = 4/8 + 1/8 = 5/8

Now we'll divide n = 2 over that result. The n = 2 refers to the number of items in the original set.

n divide over (5/8) = 2*(8/5) = 16/5 which is the answer as an improper fraction

-----------

To convert to a mixed number, we can do the following:

16/5 = (15+1)/5

16/5 = 15/5 + 1/5

16/5 = 3 + 1/5

16/5 = 3 & 1/5

Or if you need the answer in decimal form, then using a calculator would get you 16/5 = 3.2

6 0
3 years ago
Other questions:
  • How do I find slope of a line (0,3) and (8,-3)
    12·2 answers
  • Evaluate csc(3π/4)<br><br><br> please show work
    7·2 answers
  • Arnold buys 3
    14·1 answer
  • Equation is best that shows 48 is a multiple of three
    14·1 answer
  • When constructing parallel lines, how can you verify the lines constructed are parallel?t is being constructed based on the mark
    8·1 answer
  • CAN U PLS HELP
    9·1 answer
  • Identify the opposite numbe 10
    10·1 answer
  • I need the work and answers fast
    7·1 answer
  • Find the area of ABC to the nearest tenth, if necessary
    9·1 answer
  • A shirt and a tie together cost $57. The shirt costs $33 more than the tie. What is the cost of the shirt?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!