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
HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE please
VMariaS [17]

Answer:

50.5

Step-by-step explanation:

Sooo first we calculate edf. 11/2= 5.5, 5.5x5=27.5

And then we do the other part.9/5=4, and 4x11.5=46, and we need to cut that in half cuz it’s a triangle 46/2=23. We add up the rectangle and the triangle: 27.5+23=50.5

3 0
3 years ago
(Algebra 2) write a polynomial function of least degree with integral coefficients that has the given zeros.
saveliy_v [14]

Answer:

x^{2} -2ix+3=0 .

Step-by-step explanation:

Given the zeroes of the polynomial are

a=-i . and b=3i

The recquired polynomial is (x-a)(x-b)=0

On substituting the values of a and b we get

(x+i)(x-3i)=0

x^{2} -3xi+ix-3i^{2}=0

x^{2} -2ix+3=0 .       (∵i^{2}=-1)

6 0
3 years ago
The school cafeteria offers three choices for the main course (peanut
Elena-2011 [213]

Answer: 18 different combinations

Step-by-step explanation: When finding out combinations, you just multiply all the numbers. In this case, it would be 3x2x3 which equals 18. Please mark brainliest <3

6 0
2 years ago
ILL GIVE MEDAL AND BRAINLIST AWNSER TO whoEVER IN THE FIRST!!!!Roland's heart beats 495 times in 6 minutes. At that rate, how ma
Sonbull [250]

<em>Answer,</em>

C. 1650

<em>Explanation,</em>

<em>495/6 = 82.5</em>

<em>82.5 x 20 = </em><em>1650</em>


<u><em>Hope this helps :-)</em></u>

7 0
3 years ago
The step function f of x is graphed what is the value of f of 0?​
zzz [600]

Answer:

AYYYYYYYYYYYY YO IS SNOOP DOGG

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • Which expression is equivalent to 10x-2x?<br> A: 8x²<br> B: x²<br> C: -10x²+2x<br> D: 10x²-2x
    8·1 answer
  • I NEED HELP ON THIS MATH ASAP
    12·1 answer
  • Please help me out please!!!!!!!!!
    12·2 answers
  • devon drives 3/4 the distance to his house in 2 1/2 hours at this speed how long will the entire trip take(can i divide)
    11·1 answer
  • The dewey civic center has 2500 seats. Tickets for 72% of the yotal number of seats were sold. How many tickets were sold?
    8·1 answer
  • Choose any three digit number to describe how to find the number that is 10 more
    15·1 answer
  • Which is the slope of the line that passes through the points (2,10) and (5,8)? slope =23 slope =75 slope =25 slope =−23
    9·2 answers
  • Can someone help me with Ratios and Proportions? I’m really struggling for Geometry
    5·1 answer
  • The product of 4 and a number x
    7·2 answers
  • Find the value of x. If necessary, round your answer to the nearest tenth. The figures are not drawn to scale.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!