Question

Check whether the following is the quadratic equations: (x + 2)³ = 2x(x² - 1)

Answer 1

(x + 2)³ = 2x(x² - 1)

⇒ x³ + 8 + x² + 12x = 2x³ - 2x

⇒ x³ + 14x - 6x² - 8 = 0

It is not of the form ax² + bx + c = 0.

Hence, the given equation is not a quadratic equation.