To identify like terms in the expression \(3x - 4 + x + 7\), we can first group the terms:
- The terms with \(x\) are \(3x\) and \(x\).
- The constant terms are \(-4\) and \(7\).
Now we can analyze the options given:
A. \(3x\) and \(x\) - These are like terms (both are terms with \(x\)). B. \(-4\) and \(7\) - These are like terms (both are constant terms). C. \(3x\) and \(-4\) - These are not like terms (one is a term with \(x\), the other is a constant). D. \(x\) and \(-7\) - These are not like terms (one is a term with \(x\), the other is a constant and also there is no \(-7\) in the original expression).
The correct answers are:
- A. \(3x\) and \(x\)
- B. \(-4\) and \(7\)
Thus, the pairs of like terms in the expression are A and B.