SOLUTION: Find the axis of symmetry of y = 2x squared + 8x - 7

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Question 124661: Find the axis of symmetry of y = 2x squared + 8x - 7
Found 2 solutions by stanbon, jim_thompson5910:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Find the axis of symmetry of y = 2x squared + 8x - 7
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The axis occurs where x=-b/2a = -8/(2*2) = -2
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graph%28400%2C300%2C-10%2C10%2C-20%2C10%2C2x%5E2%2B8x-7%29
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Cheers,
Stan H.

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=2x%5E2%2B8x-7 we can see that a=2 and b=8

x=%28-8%29%2F%282%2A2%29 Plug in b=8 and a=2


x=%28-8%29%2F4 Multiply 2 and 2 to get 4



x=-2 Reduce


So the axis of symmetry is x=-2