Find the vertex of the following quadratic functions: 1. (1,0) (-1,-2) (1,-3) (1,2) 2. (-3,-5) (-3,3) (-1,-5) (3,-5) 3. (a,4-a) (a,4a3) (-a,a2) (-a,4-a3) 4. (6,-5) 5. (-4,4) (4,16) (4,0) (4,4) Press the Submit button to see the results.