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
spin [16.1K]
3 years ago
13

Solve x2-14x+21=0 by completing the square

Mathematics
1 answer:
ankoles [38]3 years ago
4 0
x^2-14x+21=0\\\\x^2-2x\cdot7+7^2-7^2+21=0\\\\(x-7)^2-49+21=0\\\\(x-7)^2-28=0\\\\(x-7)^2=28\iff x-7=-\sqrt{28}\ \vee\ x-7=\sqrt{28}\\\\x=7-\sqrt{4\cdot7}\ \vee\ x=7+\sqrt{4\cdot7}\\\\x=7-2\sqrt7\ \vee\ x=7+2\sqrt7
You might be interested in
Mr.Johnson weighs 135 pounds. Her husband weighs 80 kilogram. How many fewer pounds does Ms.Johnson weigh than her husband?
sweet-ann [11.9K]
First you convert kilograms to pounds,
1 kilogram = 2.205 pounds
next you times the number of pounds per kilogram by the number of kilograms given that need to be turned into pounds.
80 times 2.205 = 176.4
next you subtract to get the answer
176.4 - 135= 41.4
so Ms. Johnson weighs 41.4 pounds less than herr husband


3 0
3 years ago
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your
Mila [183]

The critical value of r is mathematically given as r = +0.487, with no significant linear correlation. Option A.

<h3>What are the critical values of r?</h3>

Question Parameters

r = -0.868

n = 5

df = 5 - 2

df = 3

\alpha / 2 =0.025

Critical values r= \pm 0.878

Generally, there exists no linear correlation between the Critical values

as r=0.878

In conclusion,  Critical values: r = +0.487, no significant linear correlation

Read more about Critical values

brainly.com/question/14508634

#SPJ1

5 0
2 years ago
Don’t solve just write the equation!!!
erastovalidia [21]

Answer:

2(x - 4) = 16

8 0
3 years ago
A jar of candy has 6 cinnamon, 5 peppermint and 7 spearmint candies in it. Your pick three pieces of candy out of the jar at the
Vitek1552 [10]

Answer: 3/18  simplified 1/6

Step-by-step explanation:

6+5+7= whole (18)

1+2=part (3)

3 0
3 years ago
4(1-x) + 2x = -3( x + 1)
vlada-n [284]

Answer:

x = -7

Solution:

4(1-x) + 2x = -3( x + 1)

4(1 - x) + 2x = -3 (x + 1)

4(-x + 1) + 2x = -3 (x + 1)

-4x - 4 + 2x = -3(x + 1)

-2x + 4 = -3 (x + 1)

8 0
3 years ago
Other questions:
  • MJ Supply distributes bags of dog food to pet stores. Its markup rate is 28%. Which equation represents the new price of a bag,
    6·1 answer
  • A theater company with 9 actors is putting on a play that has 3 roles. In how many different ways can the director assign actors
    10·2 answers
  • In forming a contract, the “meeting of the minds” is _____.
    6·1 answer
  • Rochelle works part-time at the college museum, which pays her at a rate of $10 per hour. She also makes small bracelets that sh
    12·2 answers
  • Triangle ABC has vertices with Alx, 3).
    8·1 answer
  • The sum of three consecutive integers is 267. What is the largest integer?
    15·1 answer
  • For the choir concert, the choir director has asked that everyone wear either black pants or blue jeans. Three times as many stu
    6·1 answer
  • State whether each percent of change is a percent increase or a percent decrease. Then find the percent of increase or decrease
    8·1 answer
  • The expression two square root of three minus square root of 27 is equivalent to
    13·2 answers
  • Rewrite the following equation as a function of x. 680x + 10y -1000 = 0
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!