1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
stellarik [79]
3 years ago
12

A student solved 3/x−4=x/7 in six steps, as shown.

Mathematics
2 answers:
Rudiy273 years ago
7 0

Answer:

A. The student solved the equation correctly.

Step-by-step explanation:

We have been given a student's work to solve the equation \frac{3}{x-4}=\frac{x}{7}. We are asked to chose accurate interpretation of the student's work.

Step 1: Multiply both sides by (x-4).

\frac{3}{x-4}(x-4)=\frac{x}{7}(x-4)

3=\frac{x(x-4)}{7}

Step 2: Multiply both sides by 7.

3\times 7=\frac{x(x-4)}{7}\times 7

21=x(x-4)

Step 3: Distribute x on right ride.

21=x\cdot x-x\cdot 4

21=x^2-4x

Step 4: Subtract 21 from both sides.

21-21=x^2-4x-21

0=x^2-4x-21

Step 5: Factor by splitting the middle term.

0=x^2-7x+3x-21

0=(x-7)(x+3)

Step 6: Use zero product property.

(x-7)=0, (x+3)=0

x=7,x=-3

Since student's work is correct, therefore, option A is the correct choice.

Stolb23 [73]3 years ago
5 0

Answer:

Option A.

Step-by-step explanation:

The given equation is

\dfrac{3}{x-4}=\dfrac{x}{7}

Step 1: Multiply both sides by (x-4).

3=\dfrac{x(x-4)}{7}

Step 2: Multiply both sides by 7.

21=x(x-4)

Step 3: Using distributive property.

21=x^2-4x

Step 4: Isolate all terms on one side.

0=x^2-4x-21

Step 5: Find factors by splitting the middle term.

0=x^2-7x+3x-21

0=x(x-7)+3(x-7)

0=(x-7)(x+3)

Step 6: Using zero product property, we get

x=-3, x=7

It means student solved the equation correctly.

Therefore, the correct option is A.

You might be interested in
Anyone know how to do this
Anton [14]

let

(hypotenuse ) c = 10 in

(perpendicular) a = 8 in

(base) b =?

By using Pythagoras theorem

c^2= a^2+b^2

(10)^2 = (8)^2 +(b)^2

100 = 64 +(b)^2

100- 64 = (b)^2

36 = (b)^2

√36 = b

6 = b

hence b= 6 in

3 0
2 years ago
Shipping department 17 employees budget of 3715 budget
Masja [62]
Please explain more...
5 0
3 years ago
Read 2 more answers
100 divided by 32 will give brainliest
Paha777 [63]

Answer: 3.125

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Please help i am failing this class currently!!
lana [24]
Answer: A- $5,250
B- $7,750
3 0
3 years ago
3(x+1)+5(x+1)=64<br> What is x
Karo-lina-s [1.5K]

Answer:

x=7

Step-by-step explanation:

3(x+1)+5(x+1)=64

(3+5)(x+1)=64

8(x+1)=64

8x+8=64

8x=56

x=7

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the greatest common factor for 18 &amp; 130
    8·2 answers
  • The circumference of a circle is 121 pi cm, what is the area in term of pi?
    15·1 answer
  • A nature museum has 2008 specimens of early birds, some with 222 wings and some with 444 wings. The specimens have a total of 40
    8·1 answer
  • If you deposited 15,000 at an interest rate of 1.5% how much would you have after 10 years
    12·2 answers
  • Let f(n) be the average number of days a house stays on the market before being sold for price p in $1,000s, which statement bes
    13·2 answers
  • A race walker completed a 7.7 mile walk in 2.2 hours. What is the walker's speed?
    12·2 answers
  • Point
    10·1 answer
  • Select all the points that are on the graph of the equation 4y−6x=12.
    12·1 answer
  • Please help me solve this! 2 1/3 x 1 1/2
    13·1 answer
  • This table represents a quadratic function with a vertex at (1, 0). What is the
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!