This statement is true. For example:
[tex]4x^2 +12x + 6 = 0[/tex] is an example of a quadratic equation in standard form. a, b, and c are all real numbers, while a ≠ 0.
[tex] x^{2} - 4=0[/tex] is another example. a, b, and c are real numbers (b = 0), and a ≠ 0.
[tex]4i x^{2} +2x - 6=0[/tex] would not be an example of a quadratic equation in standard form. a is not a real number.
[tex]3x-4=0[/tex] is not an example because a = 0.
