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romanna [79]
3 years ago
14

Solve the equation by completing the square. Round to the nearest hundredth if necessary. x2 – 6x = 20

Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
8 0

x^2 – 6x = 20

b=-6

to complete the square, add (b/2)^2 to each side

(b/2)^2 = (-6/2)^2=(-3)^2 =9

x^2 – 6x +9 = 20+9

(x+b/2) ^2 =29

(x-3)^2=29

take the square root of each side

x-3 = +- sqrt (29)

add 3 to each side

x = 3+- sqrt (29)

x = 3 + sqrt(29), x- sqrt(29)

Answer: -2.39, 8.39

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a bottle contains 12 red marbles and 8 blue marbles. A marble is chosen at random and not replaced. Then a second marble is chos
patriot [66]
P(A)= \frac{12}{20} \cdot \frac{8}{19} + \frac{8}{20} \cdot \frac{12}{19}= \frac{12\cdot8}{20\cdot19} \cdot2=\frac{12\cdot4}{5\cdot19}= \frac{48}{95}

5 0
3 years ago
The volume of a rectangular prism is 2,058 cubic cm. The length of the prism is 3 times the width. The height is twice the width
liraira [26]
Let the width be w, length = 3w and height = 2w

Volume = length x width x height = w x 3w x 2w = 6w^3
6w^3 = 2,058
w^3 = 2,058/6 = 343
w = ∛343 = 7

width = 7 cm
8 0
3 years ago
What is wrong with the following proof that for every integer n, there is an integer k such that n < k < n + 2? Suppose n
expeople1 [14]

Answer:

c)The proof writer mentally assumed the conclusion. He wrote "suppose n is an arbitrary integer", but was really thinking "suppose n is an arbitrary integer, and suppose that for this n, there exists an integer k that satisfies n < k < n+2." Under those assumptions, it follows indeed that k must be n + 1, which justifies the word "therefore": but of course assuming the conclusion destroyed the validity of the proof.

Step-by-step explanation:

when we claim something as a hypothesis we can only conclude with therefore at the end of the proof. so assuming the conclusion nulify the proof from the beginning

4 0
3 years ago
What is the answer to 8s-11s+6
slega [8]

Answer:

-3s + 6

Step-by-step explanation:

Combine like terms. Like terms are terms with the same amount of the same variables. In this case:

8s - 11s + 6

(8s - 11s) + 6

-3s + 6

-3s + 6 is your answer.

~

7 0
2 years ago
Read 2 more answers
susan is arranging coffee mugs on shelves in her shop. she wanta each shelf to have the same number of mugs.she only wants one c
yaroslaw [1]

The <em><u>correct answers</u></em> are:

7 mugs on each shelf; and 7 shelves for blue and 8 shelves for red.

Explanation:

To find the number of mugs that will fit on each shelf, we find the GCF (greatest common factor) of 49 and 56.  To do this, we find the prime factorization of each:

49 = 7(7)

56 = 7(8)

8 = 2(4)

4 = 2(2)

56 = 2(2)(2)(7)

The only common factor is 7, so this is the GCF.  This means that she needs to put 7 mugs on each shelf.

Since there are 49 blue mugs, she needs 49/7 = 7 shelves for them.

Since there are 56 red mugs, she needs 56/7 = 8 shelves for them.

8 0
3 years ago
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