SOLUTION: Find the axis of symmetry. y=-x^2-10x+7 I am still not getting this, can you assist one more time? Thanks

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Question 127256: Find the axis of symmetry.
y=-x^2-10x+7
I am still not getting this, can you assist one more time?
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%5E2-10x%2B7 we can see that a=-1 and b=-10

x=%28--10%29%2F%282%2A-1%29 Plug in b=-10 and a=-1


x=10%2F%282%2A-1%29 Negate -10 to get 10


x=%2810%29%2F-2 Multiply 2 and -1 to get -2



x=-5 Reduce


So the axis of symmetry is x=-5