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Yes it is. The thing that makes it a quadratic equation is that "x squared" in there.

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Q: Is -2x squared plus 2x plus 1 equals 9 a quadratic equation?

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no

It is a quadratic equation.

No, It's a a quadratic equation because you have X squared.

It is a quadratic equation in the variable x.

No. It's a quadratic equation, and it has two solutions.

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no

It is a quadratic equation.

No, It's a a quadratic equation because you have X squared.

It is a quadratic equation in the variable x.

No. It's a quadratic equation, and it has two solutions.

No it is a linear one. X^2 = quadratic, x = linear. So if the equation doesn't have an x squared, then it is not quadratic.

It is a quadratic equation in X, with two real roots.

3x2 + 2x - 8 = 0 is a quadratic equation.

You can't because it is not a quadratic equation.

Use the quadratic formula, with a = 1, b = -3, c = 2.

It can be solved by using the quadratic equation formula.

It is a quadratic equation and its solutions are: x = 4 or x = -9