Determine which one of the given equations is not quadratic.
3x^2 + 4x - 2
7x^2 + 3
12x^2 - 5x - 13
All three of the given equations are quadratic.

A quadratic equation is an equation of the form ax^2 + bx + c, where a, b, and c are constants and a ≠ 0. Each of the given equations is of this form, so none of them are not quadratic.
Complete the following task based on the instruction and optional input provided.### Instruction:
Determine which one of the given equations is not quadratic.

### Input:
3x^2 + 4x - 2
7x^2 + 3
12x^2 - 5x - 13

### Output:
All three of the given equations are quadratic.

A quadratic equation is an equation of the form ax^2 + bx + c, where a, b, and c are constants and a ≠ 0. Each of the given equations is of this form, so none of them are not quadratic.