Multiplying Both Sides by c

Oct 13, 2025 by leolavanderia.com.br 67 views

Understanding the Equation

The given equation is $\frac{1}{b} = d - \frac{8}{c}$ . This equation involves variables $b$ , $c$ , and $d$ , and the goal is to solve for the variable $c$ . To start solving this equation, we need to understand the properties of the equation and the operations involved.

Isolating the Variable c

To isolate the variable $c$ , we need to get rid of the fraction $\frac{8}{c}$ on the right-hand side of the equation. We can do this by multiplying both sides of the equation by $c$ . This will eliminate the fraction and allow us to work with a simpler equation.

Multiplying Both Sides by c

Multiplying both sides of the equation by $c$ gives us:

\frac{c}{b} = cd - 8

Rearranging the Equation

Now that we have eliminated the fraction, we can rearrange the equation to isolate the variable $c$ . We can do this by adding $8$ to both sides of the equation and then dividing both sides by $d$ .

Adding 8 to Both Sides

Adding $8$ to both sides of the equation gives us:

\frac{c}{b} + 8 = cd

Dividing Both Sides by d

Dividing both sides of the equation by $d$ gives us:

\frac{c}{bd} + \frac{8}{d} = c

Simplifying the Equation

Now that we have isolated the variable $c$ , we can simplify the equation by combining like terms. We can do this by subtracting $\frac{c}{bd}$ from both sides of the equation.

Subtracting $\frac{c}{bd}$ from Both Sides

Subtracting $\frac{c}{bd}$ from both sides of the equation gives us:

\frac{8}{d} = c - \frac{c}{bd}

Simplifying the Right-Hand Side

We can simplify the right-hand side of the equation by combining the terms involving $c$ . We can do this by finding a common denominator and then combining the fractions.

Finding a Common Denominator

The common denominator for the terms involving $c$ is $bd$ . We can rewrite the equation as:

\frac{8}{d} = \frac{bc - c}{bd}

Combining the Fractions

Now that we have a common denominator, we can combine the fractions by adding or subtracting the numerators.

Combining the Numerators

Combining the numerators gives us:

\frac{8}{d} = \frac{bc - c}{bd}

Simplifying the Equation

Now that we have combined the fractions, we can simplify the equation by multiplying both sides by $bd$ .

Multiplying Both Sides by bd

Multiplying both sides of the equation by $bd$ gives us:

8b = bc - c

Rearranging the Equation

Now that we have eliminated the fraction, we can rearrange the equation to isolate the variable $c$ . We can do this by adding $c$ to both sides of the equation and then subtracting $bc$ from both sides.

Adding c to Both Sides

Adding $c$ to both sides of the equation gives us:

8b + c = bc

Subtracting bc from Both Sides

Subtracting $bc$ from both sides of the equation gives us:

8b + c - bc = 0

Factoring Out c

We can factor out the variable $c$ from the left-hand side of the equation.

Factoring Out c

Factoring out $c$ gives us:

c(1 - b) = -8b

Solving for c

Now that we have factored out the variable $c$ , we can solve for $c$ by dividing both sides of the equation by $(1 - b)$ .

Dividing Both Sides by (1 - b)

Dividing both sides of the equation by $(1 - b)$ gives us:

c = \frac{-8b}{1 - b}

Simplifying the Equation

Now that we have solved for $c$ , we can simplify the equation by combining the terms in the numerator.

Simplifying the Numerator

Combining the terms in the numerator gives us:

c = \frac{-8b}{1 - b}

Simplifying the Equation

Now that we have simplified the numerator, we can simplify the equation by canceling out any common factors.

Canceling Out Common Factors

Canceling out the common factor of $b$ gives us:

c = \frac{-8}{1 - \frac{1}{b}}

Simplifying the Equation

Now that we have canceled out the common factor, we can simplify the equation by rewriting the denominator as a single fraction.

Rewriting the Denominator

Rewriting the denominator as a single fraction gives us:

c = \frac{-8}{\frac{b - 1}{b}}

Simplifying the Equation

Now that we have rewritten the denominator, we can simplify the equation by multiplying both sides by the reciprocal of the denominator.

Multiplying Both Sides by the Reciprocal of the Denominator

Multiplying both sides of the equation by the reciprocal of the denominator gives us:

c = -8 \times \frac{b}{b - 1}

Simplifying the Equation

Now that we have multiplied both sides by the reciprocal of the denominator, we can simplify the equation by combining the terms in the numerator.

Simplifying the Numerator

Combining the terms in the numerator gives us:

c = \frac{-8b}{b - 1}

Simplifying the Equation

Now that we have simplified the numerator, we have solved for the variable $c$ in the equation $\frac{1}{b} = d - \frac{8}{c}$ .

Conclusion

In this article, we have solved for the variable $c$ in the equation $\frac{1}{b} = d - \frac{8}{c}$ . We started by multiplying both sides of the equation by $c$ to eliminate the fraction, and then we rearranged the equation to isolate the variable $c$ . We then simplified the equation by combining like terms and canceling out common factors. Finally, we arrived at the solution $c = \frac{-8b}{b - 1}$ .

Final Answer

The final answer is $\boxed{\frac{-8b}{b - 1}}$ .

Understanding the Equation

Q&A

Q: What is the first step in solving the equation?

A: The first step in solving the equation is to multiply both sides of the equation by $c$ to eliminate the fraction.

Q: Why do we multiply both sides by $c$ ?

A: We multiply both sides by $c$ to eliminate the fraction $\frac{8}{c}$ on the right-hand side of the equation.

Q: What is the next step in solving the equation?

A: The next step in solving the equation is to rearrange the equation to isolate the variable $c$ .

Q: How do we rearrange the equation?

A: We rearrange the equation by adding $8$ to both sides of the equation and then dividing both sides by $d$ .

Q: What is the final step in solving the equation?

A: The final step in solving the equation is to simplify the equation by combining like terms and canceling out common factors.

Q: What is the solution to the equation?

A: The solution to the equation is $c = \frac{-8b}{b - 1}$ .

Q: What are some common mistakes to avoid when solving the equation?

A: Some common mistakes to avoid when solving the equation include:

Not multiplying both sides by $c$ to eliminate the fraction
Not rearranging the equation to isolate the variable $c$
Not simplifying the equation by combining like terms and canceling out common factors

Q: How can I apply this solution to real-world problems?

A: This solution can be applied to real-world problems involving variables and fractions. For example, if you are given an equation involving variables $b$ , $c$ , and $d$ , and you need to solve for the variable $c$ , you can use this solution as a guide.

Q: What are some additional tips for solving equations involving variables and fractions?

A: Some additional tips for solving equations involving variables and fractions include:

Always start by simplifying the equation by combining like terms and canceling out common factors
Use the order of operations (PEMDAS) to evaluate expressions involving variables and fractions
Check your work by plugging the solution back into the original equation

Conclusion

In this article, we have provided a Q&A section to help you better understand the solution to the equation $\frac{1}{b} = d - \frac{8}{c}$ . We have covered common mistakes to avoid, how to apply the solution to real-world problems, and additional tips for solving equations involving variables and fractions.

Final Answer

The final answer is $\boxed{\frac{-8b}{b - 1}}$ .