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How many variables are there in the expression (4x+5y-2z)?
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Answer and explanation
Correct answer: 3
In \(4x+5y-2z\), \(x\), \(y\), and \(z\) are letters whose values can vary, so they are variables. Hence, there are 3 variables. The numbers 4, 5, and −2 are coefficients, not variables. Exam tip: Count the distinct letters that can take values in an expression.
Frequently asked questions
What is the correct answer to this question?
3
Why is this the correct answer?
In \(4x+5y-2z\), \(x\), \(y\), and \(z\) are letters whose values can vary, so they are variables. Hence, there are 3 variables. The numbers 4, 5, and −2 are coefficients, not variables. Exam tip: Count the distinct letters that can take values in an expression.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Algebraic expressions.
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