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
Yanka [14]
2 years ago
12

John is solving x^2 + 4x + 8=0 by completing the square. Which step would be part of John's solution.?

Mathematics
1 answer:
SOVA2 [1]2 years ago
3 0

Answer:

(x + 2) ^{2}  =  - 8

Step-by-step explanation:

{x}^{2}  + 4x + 8 = 0 \\  {x }^{2}  + 4x =  - 8 \\  {x}^{2}  + 4x + 4 =  - 8   + 4 \\ ( x + 2)^{2}  =  - 4

You might be interested in
A snail travels 10 cm in 4 minutes. At this rate: How long will it take the snail to travel 24 cm?
atroni [7]

It will take the snail 9.6 minutes to travel 24cm.

Step-by-step explanation:

Distance covered in 4 minutes = 10 cm

Ratio of distance to time = 10:4

New distance = 24cm

Let,

x be the time period

Ratio of new distance to time = 24:x

Using proportions;

Ratio of distance to time :: Ratio of new distance to time

10:4::24:x

Product of mean = Product of extreme

24*4=10*x\\96=10x\\10x=96

Dividing both sides by 10

\frac{10x}{10}=\frac{96}{10}\\x=9.6\ minutes

It will take the snail 9.6 minutes to travel 24cm.

Keywords: ratio, proportion

Learn more about ratios at:

  • brainly.com/question/4027296
  • brainly.com/question/4046256

#LearnwithBrainly

7 0
3 years ago
Substatution and elimination
Salsk061 [2.6K]
Well using elimination is easy because they basically did it for you. 
4x-5y=-6
2x+5y=12
The postive 5y and negative 5y cancel out because -5y plus 5y is zero.
so you are left with
4x=-6
2x=12
Add these together
6x=18
divide both sides by 6 and Solve to find your x
x=3
Now we have to eliminate x to find y.
we multiply the second equation by -2 so it can cancel out so
(2x+5y=12)-2
-4x-10y=24
Add the equations together
4x-5y=-6
-4x-10y=24
You are left with -15y = 30
Solve for y
y = -2
So your final answer for the elimination would be 
(3,-2)
6 0
3 years ago
moby sold half his toy car collection, and then bought 12 more cars the next day. he now has 48 toy cars . how many cars did he
Zinaida [17]

Answer:

18

Step-by-step explanation:

48-12 = 36

36/2

18

5 0
3 years ago
The measure of the supplement of an angle is 12 more than twice the measure of the angle. Find the measures of the angle and it'
astra-53 [7]
Supplementary angles add up to 180 degrees-

Let x = "the angle"

supplement angle = 2x + 12 // 12 more than twice the measurement of "the angle"

Supplement angle + "the angle" = 180 degrees

(2x + 12) + x = 180 degrees // 2x + 12 is the supplement angle

3x + 12 = 180 //  Simplify

3x = 168 // Subtract 12 from both sides

x =  56 degrees // Divide both sides by 3

The measure of the angle is 56° and its supplement is 124°
3 0
3 years ago
Suppose you deposit $1,200 into a bank account. The account earns yearly simple interest at a rate of 1 3/4%. How many years wil
igor_vitrenko [27]

Answer:

6 years

Step-by-step explanation:

1.75% of 1,200 = 21

so 1 year= 21

21+21= 42         2 years

42+21=63           3 years

63+21=84            4 years

81+21=105             5 years

105+21=126            6 years

Or you can do

21x6=126 so it has to equal 6 years

4 0
2 years ago
Other questions:
  • Can u please work out the answers for me thank you x
    7·2 answers
  • What is the total amount?​
    8·2 answers
  • What is the slope-intercept form of the equation -3x + 2y = 12?
    7·1 answer
  • Bought 3 shirts that each cost the same. He had a coupon for $10 and he spent $65 in total. Which equation can be used to find t
    15·2 answers
  • If you are asked to complete 5 sit-ups for every 9 push-ups you complete, answer each of the following questions:
    9·1 answer
  • MATH SMARTIES I WILL GIVE BRAINLIEST PLEASE GIVE EXPLINATION ALSO THANK YOU
    12·2 answers
  • Which of the following choices is the average speed of a tourist who traveled for 1 hour on a plane at 400 mph and 4 hours by ca
    5·1 answer
  • If p is true and ~q is false then p -> ~q is ___ false.
    11·1 answer
  • Functions please help
    10·1 answer
  • Find the length of CD shown in red below. Show all work.<br><br> PLEASE HELP
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!