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Which of the following becomes a quadratic equation in the variable \(x\) after simplification?
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Answer and explanation
Correct answer: \(x(x-3)=4\)
Expanding \(x(x-3)=4\) gives \(x^2-3x-4=0\), whose highest power of \(x\) is 2, so it is quadratic. Option B is an identity because both sides are identical. Exam tip: bring all terms to one side, then check the highest power.
Frequently asked questions
What is the correct answer to this question?
\(x(x-3)=4\)
Why is this the correct answer?
Expanding \(x(x-3)=4\) gives \(x^2-3x-4=0\), whose highest power of \(x\) is 2, so it is quadratic. Option B is an identity because both sides are identical. Exam tip: bring all terms to one side, then check the highest power.
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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