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Step2247 [10]
3 years ago
15

2(3x-9)=2x+10 what's x

Mathematics
2 answers:
Deffense [45]3 years ago
6 0

Answer:

x = 7

Step-by-step explanation:

In order to find the value of x, isolate it in the equation.

1) First, distribute the 2 to the terms inside the set of parentheses.

2 (3x - 9) = 2x + 10 \\6x - 18 = 2x + 10 \\

2) Next, move all the x terms to one side and all the other terms to the other side. Subtract both sides by 2x and add both sides by 18.

6x - 18 = 2x + 10 \\4x = 28

2) Divide both sides by 4 to finally isolate x.

4x = 28 \\x = 7

Thus, x = 7.

Vikentia [17]3 years ago
4 0

Answer:

x = 7

Step-by-step explanation:

2(3x-9)=2x+10

6x - 18 = 2x + 10

4x = 28

x = 7

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Resolve the expression <img src="https://tex.z-dn.net/?f=%5Cfrac%7B%28x-2%29%7D%7B%28x%5E%7B2%7D%20%2B1%29%28x-1%29%5E%7B2%7D%20
Llana [10]

The partial fraction expansion will look like

(<em>x</em> - 2)/((<em>x</em> ² + 1) (<em>x</em> - 1)²) = (<em>ax</em> + <em>b</em>)/(<em>x</em> ² + 1) + <em>c</em>/(<em>x</em> - 1) + <em>d</em>/(<em>x</em> - 1)²

Get everything in terms of a common denominator, and compare the numerators on both sides:

<em>x</em> - 2 = (<em>ax</em> + <em>b</em>) (<em>x</em> - 1)² + <em>c</em> (<em>x</em> ² + 1) (<em>x</em> - 1) + <em>d</em> (<em>x</em> ² + 1)

Expand the right side:

<em>x</em> - 2 = (<em>ax</em> + <em>b</em>) (<em>x</em> - 1)² + <em>c</em> (<em>x</em> ² + 1) (<em>x</em> - 1) + <em>d</em> (<em>x</em> ² + 1)

<em>x</em> - 2 = (<em>a</em> + <em>c</em>) <em>x</em> ³ + (-2<em>a</em> + <em>b</em> - <em>c</em> + <em>d</em>) <em>x</em> ² + (<em>a</em> - 2<em>b</em> + <em>c</em>) <em>x</em> + <em>b</em> - <em>c</em> + <em>d</em>

<em />

Match up the coefficients and solve the resulting system of equations:

<em>a</em> + <em>c</em> = 0

-2<em>a</em> + <em>b</em> - <em>c</em> + <em>d</em> = 0

<em>a</em> - 2<em>b</em> + <em>c</em> = 1

<em>b</em> - <em>c</em> + <em>d</em> = -2

==>   <em>a</em> = -1, <em>b</em> = -1/2, <em>c</em> = 1, <em>d</em> = -1/2

So the expansion into partial fractions is

(<em>x</em> - 2)/((<em>x</em> ² + 1) (<em>x</em> - 1)²) = (-<em>x</em> - 1/2)/(<em>x</em> ² + 1) + 1/(<em>x</em> - 1) - 1/(2 (<em>x</em> - 1)²)

… = -(2<em>x</em> + 1)/(2 (<em>x</em> ² + 1)) + 1/(<em>x</em> - 1) - 1/(2 (<em>x</em> - 1)²)

5 0
3 years ago
Can someone help me
True [87]

Answer:

Why is this long?

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Help I need this done fast!
wolverine [178]
B

Sorry if I’m wrong...
5 0
3 years ago
I need help please.
Westkost [7]

Answer:

A) 2.5

Step-by-step explanation:

6(2y - 1)-2(4y)=4 \\ 12y - 6 - 8y = 4 \\ 12y - 8y = 4 + 6 \\ 4y = 10 \\ y =  \frac{10}{4}  \\ y = 2.5

7 0
3 years ago
The large sample 98% confidence interval for the proportion of hotel reservations that are canceled on the intended arrival day
Digiron [165]

Answer:

27

Step-by-step explanation:

3 0
3 years ago
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