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snow_tiger [21]
4 years ago
7

Root of negative 2x plus 1 _ 3 = x

Mathematics
1 answer:
lara31 [8.8K]4 years ago
8 0
The following errors are made:

\sqrt{-2x+1}-1=x+3-1
\\ \sqrt{-2x}  =x+2 - cannot subtract 1 from radical

\sqrt{-2x} =x+2\\ \sqrt{-2x}^2 =(x-4)^2 - (x+2) should be squared

0=x^2+8x+16
\\0=(x+2)(x+6) - incorrect factoring
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Solve the Quadratic equation<br> 8n²-56=48n
Whitepunk [10]

Answer:

n = {-1, 7}

Step-by-step explanation:

8n² - 56 = 48n

Subtract 48n from both sides

8n² - 48n - 56 = 0

Divide both sides by 8

n² - 6n - 7 = 0

Factor

alternately use the quadratic equation or complete the square

(n - 7)(n + 1) = 0

n = {-1, 7}

3 0
3 years ago
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Yakvenalex [24]

Answer:

Second option

Step-by-step explanation:

x^(3)-4x^(2)-13x-6= (x+1) (3x + 2) (x-3)

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4 years ago
The radius of a frisbee is 5 inches. What is the circumference of the frisbee in terms of (pi)?
vaieri [72.5K]

Answer:

10π inches

Step-by-step explanation:

C = 2πr

C = 2π(5)

C = 10π ≈ 31.42

4 0
3 years ago
399 times 43 and work
Goshia [24]
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4 years ago
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You are choosing between two different cell phone plans. The first plan charges a rate of 25 cents per minute. The second plan c
bogdanovich [222]

Answer:You would have to use over 200 minutes in a month in order for the second plan to be preferable.

Step-by-step explanation:

Let x represent the number of minutes that you use in a month.

The first plan charges a rate of 25 cents per minute. It means that the cost of using x minutes in a month with this plan is 0.25x.

The second plan charges a monthly fee of $29.95 in addition to 10 cents per minute. It means that the cost of using x minutes in a month with this plan is

29.95 + 0.1x

For the second plan to be preferable, its cost would be lesser than the first plan. Therefore,

29.95 + 0.1x < 0.25x

29.95 < 0.25x - 0.1x

29.95 < 0.15x

0.15x > 29.95

x > 29.95/0.15

x > 200

4 0
3 years ago
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