Solve x 2 2x 4 0 by completing the square


Asked by wiki @ in Mathematics viewed by 200 People


Solve x2 + 2x = 4 for x by completing the square. x equals plus or minus square root of 5 plus 1 x equals plus or minus square root of 5 minus 1 x = 1 x = 3

Answered by wiki @



Answer:

x equals plus or minus square root of 5 minus 1

Step-by-step explanation:

we have

x^{2} +2x=4

Divide by 2 the coefficient of the x-term

2/2=1

squared the number

1^2=1

Adds both sides

x^{2} +2x+1=4+1

x^{2} +2x+1=5

Rewrite as perfect squares

(x+1)^{2}=5

take the square root both sides

x+1=(+/-)\sqrt{5}

x=(+/-)\sqrt{5}-1

therefore

x equals plus or minus square root of 5 minus 1


Do you know the better answer?

Similar Questions

What is the name of spain's longest river

Asked by wiki @ in Spanish viewed by 149 persons

What is the name of Spain's longest river? A.the Melilla B.the Ebro C.the Iberia D.the Ceuta

Similarities between the black cat and the tell tale heart

Asked by wiki @ in English viewed by 167 persons

"The Tell-Tale Heart" vs. "The Black Cat" What are two similarities between the way Poe wrote “The Tell-Tale Heart” and “The Black Cat”? (Think author’s craft)

The relative concentration of water in a hypertonic solution is

Asked by wiki @ in Biology viewed by 146 persons

The relative concentration of water in a hypotonic solution is _____.?

What is the recommended next step after a defibrillation attempt

Asked by wiki @ in Biology viewed by 44 persons

Which is the recommended next step after a defibrillation attempt?

How wide is the amazon river at its widest point

Asked by wiki @ in Geography viewed by 70 persons

Which of the following statements about the amazon river are false? A. the amazon river can grow up to 30 miles wide during the rainy reason. B. more than 1,000 …

What were the main parts of president johnson's reconstruction plan

Asked by wiki @ in History viewed by 151 persons

List three main parts of Johnson's reconstruction plan

What is a light year and what does it measure

Asked by wiki @ in Chemistry viewed by 134 persons

A light year measure the distance a lightbeam can travel in one year one light year is equivalent to 9500000000000 km why do scientist use light years to measure distances …

27 is what percent of 60

Asked by wiki @ in Mathematics viewed by 123 persons

27 is what percent of 60?

What is the sum of the first five prime numbers

Asked by wiki @ in Mathematics viewed by 169 persons

What is the sum of the first 5 prime numbers?

What was the union army's response to the emancipation proclamation

Asked by wiki @ in History viewed by 114 persons

What was the union army's response to the emancipation proclamation? it allowed african americans to serve in non-combat positions only. it began accepting african american recruits for the first time. …

How many odd numbers are there between 10 and 20

Asked by wiki @ in Mathematics viewed by 159 persons

I am an odd number between 10 and 20. I can be divided by 3. What number am I?

How has globalization affected human health in the 20th century

Asked by wiki @ in History viewed by 145 persons

How has globalization affected human health in the 20th century? A. It has prevented diseases from spreading outside of small geographic areas. B. It has allowed medical treatments and innovations …

What does the random variable of a binomial experiment measure

Asked by wiki @ in Mathematics viewed by 136 persons

What does the random variable for a binomial experiment of n trials measure?the random variable measures the number of successes out of n trials.the random variable measures the number of …

Is cooked rice ok to eat if left out overnight

Asked by wiki @ in Physics viewed by 91 persons

You found cooked rice left out on the counter all night, the safe way to handle it is to: A. Put the rice in the refrigerator B. Throw the rice …

What does the primary structure of a protein refer to

Asked by wiki @ in Biology viewed by 101 persons

The primary structure of a protein refers to the sequence of amino acids that are linked together in a long chain. Which of the following common items would best represent …

In which ancient civilization did the sport of cuju originate

Asked by wiki @ in Health viewed by 109 persons

In which ancient civilization did the sport of cuju originate?

Suppose that the demand and supply schedules for rental apartments

Asked by wiki @ in Business viewed by 27 persons

Suppose that the demand and supply schedules for rental apartments in the city of gotham are as given in the table below. a. what is the market equilibrium rental price …

Valence bond theory does not address the issue of ________

Asked by wiki @ in Business viewed by 151 persons

Valence bond theory does not address the issue of ________.

5 elements that make up the molecules in living organisms

Asked by wiki @ in Biology viewed by 178 persons

Name five elements that make up the molecules in living organisms

What evidence supports the conclusion that increased globalization is inevitable

Asked by wiki @ in History viewed by 186 persons

Need help asap!!!!! What evidence supports the conclusion that increased globalization is inevitable? (1 point) • Technology has created ties among nations. • Many countries resist the idea of free …

What are the characteristic properties of metals nonmetals and metalloids

Asked by wiki @ in Chemistry viewed by 110 persons

A) What characteristics of physical properties distinguish metals from nonmetals? B) Where are metals and nonmetals located on the periodic table? C) Using what you know about the properties of …

How to find domain in interval notation on a graph

Asked by wiki @ in Mathematics viewed by 235 persons

What is the domain and range of the graph below? You must use either interval notation or set notation

Why was yip harburg relieved when the stock market crashed

Asked by wiki @ in English viewed by 203 persons

Why was Yip Harburg relieved when the stock market crashed? The crash allowed him to write maudlin songs about hard times. Harburg was wealthy, so he did not need to …

Question 1 with 1 blank ohio state 76 michigan 65

Asked by wiki @ in Spanish viewed by 47 persons

Ohio State 76, Michigan 65 Question 2 with 1 blankFlorida 92, Florida State 104 Question 3 with 1 blankStanford 83, UCLA 89 Question 4 with 1 blankPurdue 81, Indiana 78 …

What limits the impact of public opinion on public policy

Asked by wiki @ in History viewed by 116 persons

What limits the impact of public opinion on public policy? (A) the interests of the minority (B) the interests of the majority (C) the interests of the pollsters (D) the …

Unit 3 linear functions equations and inequalities unit test b

Asked by wiki @ in Mathematics viewed by 337 persons

does anyone have the unit 3 expressions, equations, and inequalities unit test: B answer key. i really really need it. this is an EMERGENCY. PLEASE HELP ME

Deep learning performs better when sequential processing is used brainly

Asked by wiki @ in Computers and Technology viewed by 922 persons

Select the correct answer. Tom recently visited a science exhibition where he learned that computer experts programmed robots to act like humans. They used programming languages that applied principles of …

What is the greatest common factor of 54 and 36

Asked by wiki @ in Mathematics viewed by 44 persons

What is the GCF (greatest common factor) of 36 and 54

What is the length of one side of the square

Asked by wiki @ in Mathematics viewed by 147 persons

The length of one side of a square is 3n+2. The Perimeter of the square is 4(3n+2).Which expression is equivalent to the perimeter.

What does an organism's phenotype describe

Asked by wiki @ in Biology viewed by 155 persons

What does an organism's phenotype describe? A. the allele combination for a trait B. the physical appearance of a trait C. the number of alleles on a gene D. the …

Most viewed questions in Mathematics


Gina wilson all things algebra 2015 answer key unit 11

Asked by wiki @ in Mathematics viewed by 4914 persons


Unit 11 volume and surface area homework 3 answer key

Asked by wiki @ in Mathematics viewed by 4304 persons


3.2 puzzle time what is roz savage famous for answers

Asked by wiki @ in Mathematics viewed by 3366 persons



An artist sells a painting for 20.50 but uses 5.75

Asked by wiki @ in Mathematics viewed by 2980 persons


Gina wilson all things algebra 2016 answer key unit 11

Asked by wiki @ in Mathematics viewed by 2734 persons


Geometry unit 11 volume and surface area quiz 11 1

Asked by wiki @ in Mathematics viewed by 2691 persons



Unit 4 congruent triangles homework 1 classifying triangles gina wilson

Asked by wiki @ in Mathematics viewed by 2485 persons


Cryptic quiz what is the opposite of a professional eater

Asked by wiki @ in Mathematics viewed by 2329 persons


Algebra 1 8.2 worksheet characteristics of quadratic functions answer key

Asked by wiki @ in Mathematics viewed by 2065 persons



Unit 1 test study guide geometry basics answer key

Asked by wiki @ in Mathematics viewed by 2004 persons


The price of salmon at a fish market is 5.40

Asked by wiki @ in Mathematics viewed by 1962 persons


What did captain hook say in the bakery worksheet answers

Asked by wiki @ in Mathematics viewed by 1943 persons



Gina wilson all things algebra 2015 unit 11 answer key

Asked by wiki @ in Mathematics viewed by 1716 persons


Why did the picture go to jail puzzle time answers

Asked by wiki @ in Mathematics viewed by 1702 persons


Trigonometry maze answer key

Asked by wiki @ in Mathematics viewed by 1677 persons