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Wewaii [24]
3 years ago
13

Can you solve (4x-3)/(x+2)+(15)/(x-3)

Mathematics
2 answers:
Murljashka [212]3 years ago
8 0
Please see the pic, I'd solved in it.

Andrews [41]3 years ago
3 0
\frac{4x-3}{x+2} + \frac{15}{x-3} = 0
1st step: We need to have a common denominator.
So we do this:
\frac{(4x-3)*(x-3)}{(x+2)*(x-3)} + \frac{(15)*(x+2)}{(x-3)*(x+2)} = 0
2nd step: Distribute them
\frac{4x^{2}-3x-12x+9}{(x-3)(x+2)} + \frac{15x+30}{(x+2)(x-3)} = 0
3rd step: Do the rest of the equation!
We can put it on one fraction, its fine.
\frac{4x^2-15x+9+15x+30}{(x+2)(x-3)} = 0
\frac{4x^2+39}{(x+2)(x-3)} = 0 (-15 and 15 cancels out)
4th step: take the denominator to the other side
4x²+39 = 0 (anything × 0 = 0)
5th step: Take 39 to the other side
4x² = -39
6th step: Divide by 4 on both sides
\frac{4x^2}{4} = -\frac{39}{4}
(4 and 4 cancels out)
x² = -\frac{39}{4}
7th step: Take the square root to keep x alone
x = -\sqrt\frac{39}{4}
It can also be written as:
x = -\frac{ \sqrt{39} }{ \sqrt{4} }
Final answer:
x = -\frac{ \sqrt{39} }{2}
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lorasvet [3.4K]

Answer:

D

B

Step-by-step explanation:

1. x² - 5x = 14

x² -5x -14 = 0

x² +2x -7x -14 = 0

x(x + 2) -7(x + 2) = 0

x - 7 or x + 2 = 0

x = 7 or x = -2

2. y² + 6y + 9 = 49

y² + 6y +9 -49 = 0

y² +6y -40 = 0

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y(y + 10) -4(y + 10) = 0

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8 0
3 years ago
"A 12​-foot ladder is leaning against a building. If the bottom of the ladder is sliding along the pavement directly away from t
Svet_ta [14]

Answer:

Step-by-step explanation:

The question has typographical errors. The correct question is:

"A 12​-foot ladder is leaning against a building. If the bottom of the ladder is sliding along the pavement directly away from the building at 3 ​feet/second, how fast is the top of the ladder moving down when the foot of the ladder is 5 feet from the​ wall?

Solution:

The ladder forms a right angle triangle with the ground. The length of the ladder represents the hypotenuse.

Let x represent the distance from the top of the ladder to the ground(opposite side)

Let y represent the distance from the foot of the ladder to the base of the wall(adjacent side)

The bottom of the ladder is sliding along the pavement directly away from the building at 3ft/sec. This means that y is increasing at the rate of 3ft/sec. Therefore,

dy/dt = 3 ft/s

The rate at which x is reducing would be

dx/dt

Applying Pythagoras theorem which is expressed as

Hypotenuse² = opposite side² + adjacent side², it becomes

x² + y² = 12²- - - - - - - -1

Differentiating with respect to time, it becomes

2xdx/dt + 2ydy/dt = 0

2xdx/dt = - 2ydy/dt

Dividing through by 2x, it becomes

dx/dt = - y/x ×dy/dt- - - - - - - - - - 2

Substituting y = 5 into equation 1, it becomes

x² + 5 = 144

x² = 144 - 25 = 119

x = √119 = 10.91

Substituting x = 10.91, dy/dt = 3 and y = 5 into equation 2, it becomes

dx/dt = - 5/10.91 × 3

dx/dt = - 1.37 ft/s

7 0
3 years ago
Write the equation of the circle centered at ( 4 , − 5 ) with radius 18.
Free_Kalibri [48]

Answer:

(x-4)^2 + (y+5)^2 = 324

Step-by-step explanation:

The equation of a circle is given by the equation (x-h)^2 + (y-k)^2 = r^2, where (h,k) is the center point of the circle.

Therefore, since the center point of the circle and the radius is given, we can just plug the numbers into the formula:

(x-4)^2 + (y+5)^2 = 18^2

<u>(x-4)^2 + (y+5)^2 = 324</u>

3 0
3 years ago
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Inga [223]

Answer:

rotation and reflection

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