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
juin [17]
2 years ago
10

Solve by completing the square: x^2+18x+45=0

Mathematics
1 answer:
MrRa [10]2 years ago
5 0

Answer:

 x = -3 , - 15

Step-by-step explanation:

<em>Given:</em>

<em>x² + 18x + 45 = 0</em>

<em>Solve:</em>

<em />x_{1,\:2}=\frac{-18\pm \sqrt{18^2-4\cdot \:1\cdot \:45}}{2\cdot \:1}

Simplify

-18\pm \sqrt{18^2-4\cdot \:1\cdot \:45=12

x_{1,\:2}=\frac{-18\pm \:12}{2\cdot \:1}

Separate the solution

x_1=\frac{-18+12}{2\cdot \:1},\:x_2=\frac{-18-12}{2\cdot \:1}

x_1=\frac{-18+12}{2\cdot \:1}=-3

x_2=\frac{-18-12}{2\cdot \:1}=-15

Thus, the answer are:

x=-3,\:x=-15

<u><em>Kavinsky</em></u>

You might be interested in
Find the slope of the line passing through the points (-9, -6) and [<br> (-4, 5)
lora16 [44]

Answer:

y2-y1         5--6            11

--------   =.  --------   =     ----

x2-x1         -4 --9           5

Step-by-step explanation:

3 0
3 years ago
A computer program contains one error. In order to find the error, we split the program into 6 blocks and test two of them, sele
Aleksandr-060686 [28]
There are \dbinom62 ways of selecting two of the six blocks at random. The probability that one of them contains an error is

\dfrac{\dbinom11\dbinom51}{\dbinom62}=\dfrac5{15}=\dfrac13

So X has probability mass function

f_X(x)=\begin{cases}\dfrac13&\text{for }x=1\\\\\dfrac23&\text{for }x=0\end{cases}

These are the only two cases since there is only one error known to exist in the code; any two blocks of code chosen at random must either contain the error or not.

The expected value of finding an error is then

\displaystyle\sum_{x=0}^1xf_X(x)=0\times\dfrac23+1\times\dfrac13=\dfrac13
7 0
3 years ago
What’s the answer to this please? Thanks!
Serjik [45]

Answer:

70

  1. beacuse (2x-35)+75=180
  2. (2x-35)=105
  3. 2x=140
  4. x=70
3 0
3 years ago
A fair 6-sided die is rolled 10 times (each roll is independent). What is the probability that the rolled die will not show an e
Anestetic [448]

Answer:

1/1024.

Step-by-step explanation:

There are 3 odd numbers  in the numbers from 1 to 6. So:

Probability (one toss is odd) = 3/6 = 1/2.

So the Probability ( 10 tosses are all odd) = (1/2)^10

= 1/1024.

7 0
3 years ago
Which of the following number is not a perfect cube? 64 or 729 or 800 or 1331 can some1 say it fastt plsss
goldenfox [79]

Answer:

800

Step-by-step explanation:

9.28 is answer of cube 800

5 0
2 years ago
Other questions:
  • PLEASE HELP ASAP! 20 POINTS BRAINLIEST IF RIGHT
    13·2 answers
  • What is the answer? To Solve This Problem?
    8·2 answers
  • Which is the better deal 0% interest on a $28,300 car or purchasing a $22,000 vehicle with a five-year 6% simple interest loan
    10·1 answer
  • Which values make the inequality 3x – 8 ≤ 46 true?
    12·1 answer
  • Y = 69x - 43x + 9 need help please
    15·1 answer
  • What is the area of a circle with radius 5 cm
    10·2 answers
  • 100 points!!!!!!!!!!!!!!!!!!!!What should the numerator of the second fraction be so that the fractions are equivalent?
    11·2 answers
  • Kendrick walked 500 m per day, every day for one week. How many kilometers did he walk for the week?
    10·1 answer
  • Gavin has 16 blue marbles and 8 white ones. If he wants to place them in identical groups
    9·1 answer
  • Choose all that are like terms with 5x.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!