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Sveta_85 [38]
3 years ago
6

Look at the rational expression below. x^2-4/2-x Which value of x makes the expression undefined?

Mathematics
2 answers:
Andreas93 [3]3 years ago
4 0
The answer would 2, since you cannot divide anything by 0 as it would be undefined. 2 is the only number that gives you this option 
Furkat [3]3 years ago
3 0

Answer:

given rational function is undefined for x = 2

Step-by-step explanation:

The given rational function is

\frac{x^2-4}{2-x}

The rational function is undefined if the denominator is zero.

Hence, the given rational function is undefined if

2-x=0

Solve the equation for x

x=2

Therefore, the given rational function is undefined for x = 2

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Please help..!!!!!!!
Morgarella [4.7K]

Answer:

E) (-4, -3)

Step-by-step explanation:

To use elimination, you need to have one variable in both equations that have the same coefficient. (The coefficient is the number attached to the variable). Both equations have "7y".

The way elimination works is by eliminating one of the variables first. Decide how (-7y) and (-7y) can cancel out and become 0. You can either add or subtract.

(-7y) - (-7y)        Try subtracting

= (-7y) + 7y

= 0

Based on this, we should subtract the whole equations.

Set up the equations like normal subtraction. Then, subtract each of the terms that have the same variable.

.   4x - 7y = 5

<u>-   9x - 7y = -15</u>       Do 4x - 9x = -5x.    -7y - (-7y) = 0.      5 - (-15) = 20.

.    -5x - 0 = 20       "y" cancelled out

.          -5x = 20          Isolate 'x'

.      -5x/-5 = 20/-5       Divide both sides by -5

.              x = -4          Solved x-coordinate

Substitute 'x' for -4 in any of the equations. Then simplify and isolate "y" to solve for the y-coordinate.

4x - 7y = 5

4(-4) - 7y = 5         Simplify the multiplication.

-16 - 7y = 5         Start isolating 'y' now

-16 + 16 - 7y = 5 + 16         Add 16 to both sides. Left side cancels out 16

-7y = 5 + 16         Solved right side by adding

-7y = 21

-7y/-7 = 21/-7         Divide both sides by -7

y = -3              Solved y-coordinate

Therefore the answer is (-4, -3).

5 0
3 years ago
Pls answer this question
sergejj [24]

Answer:

2.5 cm

Step-by-step explanation:

Convert the mixed numbers to improper fractions, then find the LCD and combine.

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Answer:

44 48

Step-by-step explanation:

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