Answer: (1) and (3) are quadratic; (2) is not.
- (1) \(x^2 + 2x + 11 = 0\): quadratic.
- (2) The \(x^2\) terms cancel: \(-2x + 5 = 0\), a linear equation.
- (3) \(x^2 + 4x + 4 = 2x^2\) gives \(x^2 - 4x - 4 = 0\): quadratic.
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Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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