D. PRACTICE EXERCISES:
State if the given function is quadratic or not.
1. y = - x + 7 ___
2. y = x² - 1 ___
3. f(x) = x² - 2x + 5 ___
4. y = 2x² + 3 ___
5. g(x) = x³ - 2x + 1 ___
6. f(x) = x² + 2x + 1 ___
7. A(x) = 3x + 2 ___
8. A(x) = 2 - 3x² ___
9. y = x² - 2x - 5 ___
10. f(x) = x² ___

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