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Sergio039 [100]
3 years ago
8

Solve the following C^2-14=5c

Mathematics
1 answer:
kipiarov [429]3 years ago
8 0

Answer:

c = - 2, c = 7

Step-by-step explanation:

Given

c² - 14 = 5c ( subtract 5c from both sides )

c² - 5c - 14 = 0 ← in standard form

To factorise the quadratic

Consider the factors of the constant term (- 14) which sum to give the coefficient of the c- term (- 5)

The factors are - 7 and + 2, since

- 7 × 2 = - 14 and - 7 + 2 = - 5, hence

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

Equate each factor to zero and solve for c

c - 7 = 0 ⇒ c = 7

c + 2 = 0 ⇒ c = - 2

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If 3 – 5x = 2, then x =
mixas84 [53]

Answer:

x=.2

Step-by-step explanation:

3-5x=2

add 5x to both sides

-5x+5x=0

2+5x=2+5x

3=2+5x

subtract 2 from both sides

1=5x

divide each side by 5

.2=x

7 0
3 years ago
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PLEASE HURRY BRAINLIEST FOR CORRECT ANSWER In 2018, there is an average of 45.6 people per 3 square kilometers in the United Sta
Mariulka [41]

Answer:

15.2

Step-by-step explanation:

3/45.6 = 1/x        *Cross multiply.

3x = 45.6         *Divide both sides by 3.

x = 15.2

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3 years ago
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The system of equations below has no solution.
mixer [17]

Answer:

  • Second option: 0 = 26

Explanation:

This is the given system of equations:

\frac{2}{3} x+\frac{5}{2} y=15\\ \\ 4x+15y=12

A linear combination of the system is any equation formed by the algebraic addition of both equations, one or both multiplied by an arbitrary constant.

To prove that the given system has no solution you could multiply the first equation times 6 (to get rid of the fractions), multiply the second equation times - 1, and add the two results:

<u>1. First equation times 6:</u>

6\times\frac{2}{3} x+6\times\frac{5}{2}y=6\times 15\\ \\ 4x+15y=90

<u />

<u>2. Second equation times - 1:</u>

-4x-15y=-12

<u />

<u>3. Add the two new equations:</u>

0=78

<u />

<u>4. Conclusion:</u>

Since 0 = 78 is false, no matter what the value of x and y are, the conclusion is that the system of equations has not solution.

The only choice that represents that same situation is the second one, 0 = 26. That is a possible linear combination that represents that the system of equations has no solutions.

In fact, you might calculate the exact factors by which you had to multiply each one of the original equations to get 0 = 26, but it is not necessary to tell that that option represents a possible linear combination for the given system of equations.

7 0
3 years ago
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Improper fraction for 3 1/14
TEA [102]

Answer: 43/14

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So 3 times 14=42

42+1=43 and then you take the 43 and put it over the 14 so now you have your answer: 43/14

5 0
3 years ago
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Solve for x. 2 1/2 x−3/4(2x+5)=3/8 ​
MAXImum [283]
First, convert all of the fractions to decimals:
2.5x - .75 (2x + 5) = .375
Then distribute the parenthesis:
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Subtract the 1.5x:
1x + 3.75 = .375
Subtract 3.75 from both sides:
1x = -3.375
Convert back to fraction:
1x = -3 375/1000
Simplify:
X = -3 3/8

5 0
4 years ago
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