Solve the Equation: 48÷(10/x)-(x+5) with Fraction Division

Division by Fractions with Algebraic Expressions

48:10x(x+5)=? 48:\frac{10}{x}-(x+5)=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's solve this problem together.
00:09 Remember, dividing is like multiplying by the reciprocal.
00:17 A negative number times a positive number always gives a negative answer.
00:27 Now, let's divide forty-eight by ten.
00:32 Next, gather the like terms together.
00:36 And there you go! That's the solution to our question.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

48:10x(x+5)=? 48:\frac{10}{x}-(x+5)=\text{?}

2

Step-by-step solution

Let's solve the expression 48:10x(x+5) 48:\frac{10}{x}-(x+5) .

Step 1: Change the division to multiplication by the reciprocal.

We have 48:10x=48×x10 48:\frac{10}{x} = 48 \times \frac{x}{10} .

Simplifying this, we obtain:

48×x10=48x10=4.8x 48 \times \frac{x}{10} = \frac{48x}{10} = 4.8x .

Step 2: Incorporate the subtraction operation.

We now have 4.8x(x+5) 4.8x - (x + 5) .

Distribute the negative sign:

This gives us 4.8xx5 4.8x - x - 5 .

Step 3: Combine like terms.

Simplifying further, we have:

4.8xx=3.8x 4.8x - x = 3.8x .

Thus, we end with:

3.8x5 3.8x - 5 .

Therefore, the solution to the problem is 3.8x5 3.8x - 5 .

Upon reviewing the given choices, choice 1 corresponds to our calculated result: 3.8x5 3.8x - 5 .

3

Final Answer

3.8x5 3.8x-5

Key Points to Remember

Essential concepts to master this topic
  • Division Rule: Division by a fraction means multiply by its reciprocal
  • Technique: 48÷10x=48×x10=4.8x 48 \div \frac{10}{x} = 48 \times \frac{x}{10} = 4.8x
  • Check: Distribute negative signs carefully and combine like terms correctly ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to distribute the negative sign through parentheses
    Don't write 4.8x - (x + 5) as 4.8x - x + 5 = 3.8x + 5! This ignores the subtraction affecting both terms inside the parentheses. Always distribute the negative sign: 4.8x - x - 5 = 3.8x - 5.

Practice Quiz

Test your knowledge with interactive questions

\( 70:(14\times5)= \)

FAQ

Everything you need to know about this question

Why do I flip the fraction when dividing?

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Division by a fraction is the same as multiplication by its reciprocal. When you divide by 10x \frac{10}{x} , you multiply by x10 \frac{x}{10} instead!

How do I simplify 48x/10?

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Divide both the numerator and denominator by their greatest common factor. Since 48 ÷ 10 = 4.8, we get 48x10=4.8x \frac{48x}{10} = 4.8x .

What happens to the parentheses when subtracting?

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The negative sign in front of parentheses means subtract everything inside. So (x+5)=x5 -(x + 5) = -x - 5 , not x+5 -x + 5 !

How do I combine 4.8x and -x?

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These are like terms because they both have the variable x. Combine the coefficients: 4.8xx=4.8x1x=3.8x 4.8x - x = 4.8x - 1x = 3.8x .

Can I check my answer somehow?

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Yes! Pick a simple value for x (like x = 10) and substitute it into both the original expression and your answer. If they give the same result, you're correct!

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