Solve the Expression: Simplifying x-(y-x) Step by Step

Algebraic Simplification with Nested Parentheses

x(yx)=? x-(y-x)=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Note, when multiplying negative by positive, the result is always negative:
00:20 Note, when multiplying negative by negative, the result is always positive:
00:25 Let's gather terms
00:33 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

x(yx)=? x-(y-x)=\text{?}

2

Step-by-step solution

First, we address the parenthesis:

Remember that:

When we multiply a positive number by a negative number, the result will be negative.

When we multiply a negative number by a negative number, the result will be positive.

We obtain the following:

xy+x= x-y+x=

We join the x coefficients:

x+x=2x x+x=2x

Lastly we obtain:

2xy 2x-y

3

Final Answer

2xy 2x-y

Key Points to Remember

Essential concepts to master this topic
  • Rule: Distribute negative sign to each term inside parentheses
  • Technique: x(yx) x-(y-x) becomes xy+x x-y+x after distribution
  • Check: Combine like terms: x+xy=2xy x+x-y = 2x-y

Common Mistakes

Avoid these frequent errors
  • Forgetting to distribute the negative sign to all terms
    Don't just remove parentheses without distributing: x-(y-x) ≠ x-y-x! This gives -y instead of the correct 2x-y. Always distribute the negative sign to every term inside parentheses.

Practice Quiz

Test your knowledge with interactive questions

\( 100-(30-21)= \)

FAQ

Everything you need to know about this question

Why does the negative sign change x to +x inside the parentheses?

+

When you distribute a negative sign to a negative term, you get a positive! Think of it as: (x)=+x -(−x) = +x . Two negatives make a positive.

What if there are more terms inside the parentheses?

+

The same rule applies! Distribute the negative sign to every single term inside the parentheses. For example: x(y+zx)=xyz+x x-(y+z-x) = x-y-z+x

How do I remember which terms to combine?

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Look for like terms - terms with the same variable and same exponent. In xy+x x-y+x , the two x terms can be combined: x+x=2x x+x = 2x

Can I work from inside the parentheses first?

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You could simplify yx y-x first, but it doesn't help here since these are different variables. It's better to distribute immediately when you see a negative sign before parentheses.

What's the difference between -(y-x) and (-y-x)?

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(yx)=y+x -(y-x) = -y+x while (yx)=yx (-y-x) = -y-x . The first distributes a negative to each term, the second just groups two negative terms together.

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