SOLUTION: Find the axis of symmetry. y=x^2+5x–7 I am coming up with 0 (zero)as my answer and that is not one of the answers on the test. Can you assist me? Please show

Algebra ->  Graphs -> SOLUTION: Find the axis of symmetry. y=x^2+5x–7 I am coming up with 0 (zero)as my answer and that is not one of the answers on the test. Can you assist me? Please show      Log On


   

Question 127248: Find the axis of symmetry.
y=x^2+5x–7
I am coming up with 0 (zero)as my answer and that is not one of the
answers on the test. Can you assist me? Please show me the work so I can
see where I am going wrong.
Thanks
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
To find the axis of symmetry, use this formula:

x=-b%2F%282a%29

From the equation y=x%5E2%2B5x-7 we can see that a=1 and b=5

x=%28-5%29%2F%282%2A1%29 Plug in b=5 and a=1


x=%28-5%29%2F2 Multiply 2 and 1 to get 2


So the axis of symmetry is x=-5%2F2