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andrey2020 [161]
3 years ago
15

Solve the equation by completing the square. If necessary, round to the nearest hundredth.

Mathematics
2 answers:
diamong [38]3 years ago
8 0
Ax^2+bx=c
REMEMBER THIS

ok
first, make sure that a is 1
done

now take 1/2 of b and square it

-18/2=-9, (-9)^2=81
add that to both sides

x²-18x+81=19+81
x²-18x+81=99
factor perfect square
(x-9)²=100
square root both sides
don't forget positive and negative root
x-9=10
x-9=-10
ad 9 to both sides

x=19
x=-1




answer is -1; 19

2nd choice is answer
Kobotan [32]3 years ago
5 0

Answer:

Option B. x = -1, 19

Step-by-step explanation:

The given equation is x² - 18x = 19

We can get the value of x by factorizing the expression or by quadratic formula.

We will try to factorize the equation first. If we find no factors then we will apply quadratic formula to get the value of x.

x² - 18x - 19 = 0

x² - 19x + x - 19 = 0

x(x - 19) + 1(x - 19) = 0

(x - 19)(x + 1) = 0

x = 19, -1 will be the solutions.

So there is no need to apply quadratic formula.

Option B. x = -1, 19 is the answer.

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A Jerome's rock band recorded 13 songs during an afternoon recording session. Each song took 1/6 of a side of a tape to record.
Lapatulllka [165]
Answer:
number of tape sides = 2.1667 tape sides

Explanation:
We know that each song took 1/6 of a side of tape to be recorded.
To know how many tape sides were used to record 13 songs, all we have to do is cross multiplication as follows:
1 song ..................> 1/6 of a tape side
13 songs ..............> ?? tape sides

Number of tape sides = [(13) * (1/6)] / 1
number of tape sides = 2.1667 tape sides

Hope this helps :)
8 0
3 years ago
Please help me in this it's similar figures assessment​
OLEGan [10]

Answer:

20

Step-by-step explanation:

the triangles are similar so the sides are in proportion

(x/10)=(12/6)

6x=10*12

x=10*12/6=20

3 0
3 years ago
4.05 as a mixed number
kondor19780726 [428]
4.05 in a mixed number is 4 1/2
6 0
2 years ago
Read 2 more answers
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mrs_skeptik [129]

x=0.2

y=2.4

\frac{0.2}{2.4} \\

5 0
2 years ago
Read 2 more answers
HELP MEEEE PLEASEEEE!!!!!
ad-work [718]

Answer:

{x| -2 ≤ x < 5}

Step-by-step explanation:

The domain is the x value in a graph, function e.t.c. From the farthest point to the left of the x-axis, we see -2. And from the farthest point to the right of the x-axis, we see 5. Therefore, the domain is {x| -2 ≤ x < 5}, Option C

Look here for visuals:

8 0
2 years ago
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