1. second derivative test 4−x2
2. second derivative test x2−2x−3
3. second derivative test x3−3x+1
4. second derivative test x2−6x+8
5. second derivative test x3−3x
6. second derivative test (x+5)2
7. second derivative test 1x2 +1x
8. second derivative test 2x2+6x
9. second derivative test 19+x2
10. second derivative test 3x3−1