Answer:
1. B (A and C are linear and cubic equations, respectively)
2. A (yes, a≠0)
3. C (ax² + bx + c = 0 is the standard form of a quadratic equation)
4. A (by subtracting 2 both sides of the quadratic equation)
5. A (can also be expressed as x² + 0x - 9 = 0)
6. C (choices A and B are applied only to select [factorable] quadratic equations)
7. A (-12/1)
8. C (-(-7)/1)
9. C ((-30/2)² = 225)
Quadratics! One of my favorites.
That's all. Hope you get a perfect score.
