Which of the following is not a quadratic equation?

In this equation x² + 3x - 2 = x² - 2x is not a quadratic equation.

Step-by-step explanation:

The equation which contains x² term (In simplified form), then only we can apply quadratic formula.(i.e equation is quadratic)

A. ax² + bx = 0,

Yes , Since x² term is present here ,so we can use quadratic formula.

B. 3x² = -4x - 1

We can simplify this,

i.e  3x² + 4x + 1 = 0

Since x² term is present here ,so we can use quadratic formula.

C. x² = 5

Yes , Since x² term is present here ,so we can use quadratic formula.

D. x² + 3x - 2 = x² - 2x

We can simplify this,

x² - x² + 3x + 2x - 2 = 0

or 5x - 2 = 0

Since x² term is not  here ,so we can not use quadratic formula.

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step-by-step explanation:

i think the answer would be c