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
Doss [256]
3 years ago
12

Solve using completing the square x^2 – 8x + 16 = 25

Mathematics
1 answer:
lisov135 [29]3 years ago
5 0

First we need to factor the left side. Since it is a perfect square (as is the process with completing the square, we know we can take half of the middle number along with x to be in the two parenthesis.

(x - 4)(x - 4) = 25

Now we simplify to show it as a square.

(x - 4)^2 = 25

Next we take the square root of both sides

x - 4 = +/- 5

Note that we have plus or minus 5. This is because either square would give us positive 25. Now we add 4 to both sides

x = 4 +/- 5

4 + 5 = 9

4 - 5 = -1

You might be interested in
X+Y=4 ? I think math
ryzh [129]
The answer for both is 2
4 0
3 years ago
Pls help I’ll mark brainliest
Serhud [2]
The awnser is option D
3 0
2 years ago
Read 2 more answers
the library is 0.9 miles from school. the museum is 0.6 times as far from the school as the library. how far is the museum from
LiRa [457]
Distance between library and school = 0.9 miles
Distance between museum and school = 0.9*0.6 = 0.54 miles


8 0
2 years ago
Read 2 more answers
True or false: given a sample mean of 2.1 and a sample standard deviation of 0.7 from a sample of 10 data points, a 90% confiden
iris [78.8K]
Your answer is false.

4 0
3 years ago
Today, everything at a store is on sale. The store offers a 20% discount.
lukranit [14]

Answer: A- x - 0.20x = 0.8x

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • Using the following Venn Diagram what is the probability of selecting a letter that is neither blue nor red?
    13·1 answer
  • What are some Examples of similar triangles or polygons that you may see in the real world?
    15·1 answer
  • NEED HELP FAST WILL GIVE BRAINIEST
    7·2 answers
  • the perimeter of the rectangle below is 98 units. Find the length of CD. Write your answer without variables. cd=4x+3 cb=5x+1
    10·2 answers
  • Will Mark Brainlest Helppp please​
    13·1 answer
  • Plz plz I need help plz plz really fast plz plz I will cry if u help me giving 25points
    5·1 answer
  • 6. A population of Florida fire ants grows at a rate of 8% a year. If there are 320 fire ants in
    13·1 answer
  • Keiko bought 2 CDs that were each the same price. Including sales tax,she paid a total of $34.20. Of that total, $1.80 was tax.
    12·1 answer
  • I need the answer ASAP please
    9·1 answer
  • Han got $2 from Claire, but still has less than $20 as a inequality
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!