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Quadratic Equations

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Question

Check whether the following is quadratic equation.
$(x + 2)^{3} = 2 x (x^{2} - 1)$

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Solution

$(x + 2)^{3} = 2 x (x^{2} - 1)$
$x^{3} + 8 + 6 x^{2} + 12 x = 2 x^{3} - 2 x$
Equation has degree 3.
It is a cubic equation, not a quadratic equation.

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