Axis of Symmetry/Vertex
Question 3
x=2
Question 6
x=-3,8
Question 11
x=5
x=-5
Question4
Vertex (2,-7), opens up
Question 8
x=0, -3
Question 12
x=4
x=-8
Question 18
x=3
x=-1
Question 16
x=+-sqrt(2)-3
Question 5
Vertex (0,-4), opens up
Question 7
x=2, 3
Question 13
No solution
Question 19
x=-1
x=-7
Question 15
x=9
x=-1
Question 2
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Question 9
x=2
x=-3/2
Question 14
x=7/2
x=-7/2
Question 20
x=-10+-sqrt(140)/10
Question 17
No solution