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Elodia [21]
3 years ago
5

For what value of x is the rational expression below undefined 2x+4 / x-7

Mathematics
1 answer:
Dima020 [189]3 years ago
4 0
<span> 7 because it causes the denominator to be 0. </span>
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Help please, I attached the question. Is it a!? <br> 
AVprozaik [17]

Answer:

A

Step-by-step explanation:

Recall that for a quadratic equation of the form:

0=ax^2+bx+c

The number of solutions it has can be determined using its discriminant:  

\Delta = b^2-4ac

Where:

  • If the discriminant is positive, we have two real solutions.
  • If the discriminant is negative, we have no real solutions.
  • And if the discriminant is zero, we have exactly one solution.

We have the equation:

2x^2+5x-k=0

Thus, <em>a</em> = 2, <em>b</em> = 5, and <em>c</em> = -<em>k</em>.

In order for the equation to have exactly one distinct solution, the discriminant must equal zero. Hence:

b^2-4ac=0

Substitute:

(5)^2-4(2)(-k)=0

Solve for <em>k</em>. Simplify:

25+8k=0

Solve:

\displaystyle k = -\frac{25}{8}

Thus, our answer is indeed A.

3 0
3 years ago
Read 2 more answers
Aline segment may have more than one midpoint.<br> A. True<br> B. False
wel

Answer:

False

Step-by-step explanation:

Because it not possible

7 0
3 years ago
Read 2 more answers
Determine if each set of ordered pairs represents a function
Nostrana [21]
Where is the picture?
4 0
3 years ago
Three times a number minus thirty-two
lbvjy [14]

Answer:

3n−32=7n+28

n=-15

Step-by-step explanation:

Let's solve your equation step-by-step.

3n−32=7n+28

Step 1: Subtract 7n from both sides.

3n−32−7n=7n+28−7n

−4n−32=28

Step 2: Add 32 to both sides.

−4n−32+32=28+32

−4n=60

Step 3: Divide both sides by -4.

−4n/−4=60/−4

n=−15

3 0
2 years ago
Which of the following ratios is NOT equivalent to start fraction 4 over 8 end fraction ?
zhenek [66]

Answer:

there is no options but anything that doesnt equal 1/2 esstentially because 4/8 is the same as 1/2

4 0
2 years ago
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