Which of the following are quadratic equations?
11 = $-$ 4x² $-$ x³

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Solution

Given: 11 = – 4x² – x³
On transposing all the terms of the right-hand side to the left-hand side, we get:

$x^{3} + 4 x^{2} + 11 = 0$

This is not a quadratic equation, as the highest index of the variable x is 3.

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

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