Exemplar example problem — task. Mathematics CBSE, Class 10.

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Which one of the following is not a quadratic equation?

\((x + 2)^2 = 2(x + 3)\)
\(x^2 + 3x = (-1)(1 - 3x)^2\)
\((x + 2)(x - 1) = x^2 - 2x - 3\)
\(x^3 - x^2 + 2x + 1 = (x + 1)^3\)

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