The product of two consecutive positive integers is 30. If the smaller integer is \(x\), which of the following equations represents this situation?
Answer and explanation
Correct answer: \(x(x+1)=30\)
If the smaller integer is \(x\), the next consecutive integer is \(x+1\). Since the relationship given is product, the correct equation is \(x(x+1)=30\). Option B uses a sum \(x+x+1=30\) instead of a product, so it is incorrect. Option C represents \(x\) being the larger integer (product \(x(x-1)\)), which contradicts the statement that \(x\) is the smaller one. Option D, \(2x=30\), models two equal integers (\(x+x\)), not consecutive integers. Exam tip: carefully note whether the problem states "product" or "sum" and which integer (smaller/larger) is denoted by the variable.
Frequently asked questions
What is the correct answer to this question?
\(x(x+1)=30\)
Why is this the correct answer?
If the smaller integer is \(x\), the next consecutive integer is \(x+1\). Since the relationship given is product, the correct equation is \(x(x+1)=30\). Option B uses a sum \(x+x+1=30\) instead of a product, so it is incorrect. Option C represents \(x\) being the larger integer (product \(x(x-1)\)), which contradicts the statement that \(x\) is the smaller one. Option D, \(2x=30\), models two equal integers (\(x+x\)), not consecutive integers. Exam tip: carefully note whether the problem states "product" or "sum" and which integer (smaller/larger) is denoted by the variable.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Quadratic Equations. Topic: Introduction to Quadratic Equations.
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