Find the axis of symmetry from y=x^2+4x-7

I am a student at North Central High School and I don't know the awnser to this question no matter how I try to figure it. can you give me the awnser and explain how you got there?
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1 Answer

Complete the square: y=x²+4x+4-4-7=(x+2)²-11. This shows the vertex to be at (-2,-11) and the axis of symmetry is the x coord: x=-2.

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