A. x² + 5x = 0 B. (x + 2)² = x² + 3 C. 2x² = 7 D. x(x - 1) = 4

Chapter: Quadratic Equations· Mathematics Part 1 (Algebra)

Which of the following is not a quadratic equation?

A. \(x^2 + 5x = 0\)

B. \((x + 2)^2 = x^2 + 3\)

C. \(2x^2 = 7\)

D. \(x(x - 1) = 4\)

Doubtly Asked 29 Oct 2026 Practice test ssc 10th Save WhatsApp Report

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Answer: (b) \((x + 2)^2 = x^2 + 3\)

Expanding: \(x^2 + 4x + 4 = x^2 + 3\). The \(x^2\) terms cancel, leaving \(4x + 1 = 0\), which is linear. The others have degree 2 after simplifying (\(x(x - 1) = 4\) gives \(x^2 - x - 4 = 0\)).

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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Which of the following is not a quadratic equation?

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