Exemplar exercise problems II — task. Mathematics CBSE, Class 10.

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Which one of the following is not a quadratic equation?

\(2(x - 1)^2 = 4x^2 - 2x + 1\)
\(2x - x^2 = x^2 + 5\)
\((\sqrt{2}x + \sqrt{3})^2 + x^2 = 3x^2 - 5x\)
\((x^2 + 2x)^2 = x^4 + 3 + 4x^3\)

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