Which one is a constant expression?
Answer and explanation
Correct answer: \((-12) / (-12)\)
A constant expression contains no variable such as \(x\). Option A has only numbers and its value is \(1\), so it is a constant expression. Options B, C and D contain \(x\); although they may equal \(1\) for some values, they are variable expressions and are undefined when their denominators are zero. Exam tip: First check whether a variable is present in the expression.
Frequently asked questions
What is the correct answer to this question?
\((-12) / (-12)\)
Why is this the correct answer?
A constant expression contains no variable such as \(x\). Option A has only numbers and its value is \(1\), so it is a constant expression. Options B, C and D contain \(x\); although they may equal \(1\) for some values, they are variable expressions and are undefined when their denominators are zero. Exam tip: First check whether a variable is present in the 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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