Which of the following equations is a quadratic?

Clearly, 7x 2 = 49 or 7x 2 - 49 = 0, which is of the form ax 2 + bx + c = 0, where b = 0. Thus, 7x 2 - 49 = 0 is a quadratic equation.

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Accepted Answer

Clearly, 7x² = 49 or 7x² - 49 = 0, which is of the form ax² + bx + c = 0, where b = 0.
Thus, 7x² - 49 = 0 is a quadratic equation.

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