How to find derivative (using shortcut method)
1. f(x) = 5x - 9
2. f(x) = -6x + 3
3. f(x) = x^2 + 5x - 8
4. f(x) = x^2 - 4x + 9
5. f(x) = 3x^5 + 6x^2 + 9x
6. f(x) = 2x^5 - 4x^3 + 5x - 6
7. f(x) = 7x^3 - 5x^2 - 6x + 8
8. f(x) = x^-6 + 4x^3
9. f(x) = 4x^2 + 5x^-3
10. f(x) = 6x^3 + 8x^-1