Which operations are used in the expression 2x - 4? Choose ALL that apply.
Understand the Problem
The question is asking for the identification of operations used in the algebraic expression 2x - 4. The user needs to choose all applicable operations among multiplication, division, subtraction, and addition.
Answer
Multiplication and subtraction.
Answer for screen readers
The applicable operations used in the expression $2x - 4$ are multiplication and subtraction.
Steps to Solve
- Identify the terms in the expression
The expression $2x - 4$ consists of two terms: $2x$ and $-4$.
- Recognize the operations present
- The term $2x$ indicates multiplication, where $2$ is multiplied by the variable $x$.
- The operation between $2x$ and $-4$ is subtraction.
- List the applicable operations
From the above analysis, the operations used in the expression are:
- Multiplication (from $2x$)
- Subtraction (from $2x - 4$)
The applicable operations used in the expression $2x - 4$ are multiplication and subtraction.
More Information
In algebraic expressions, multiplication can often be implied rather than explicitly written, as in the case of $2x$, which means "2 times x". The subtraction is clear from the presence of the minus sign before the 4.
Tips
- Confusing the operation: Sometimes, students might mistakenly identify subtraction as addition or overlook multiplication when variables are involved.
- Forgetting implied multiplication: As in $2x$, some may forget that this represents multiplication.
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