SOLUTION: Determine the equation of the axis of symmetry. y = -5x2 - x + 9 what is the answer to this ? ive tried multiple times and im almost out of timeeeee ?

Question 335604: Determine the equation of the axis of symmetry.
y = -5x2 - x + 9
what is the answer to this ? ive tried multiple times and im almost out of timeeeee ?
Found 2 solutions by Alan3354, Fombitz:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Determine the equation of the axis of symmetry.
y = -5x2 - x + 9
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x = -b/2a is the axis of symmetry
x = 1/(-10)
x = -1/10

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Convert the equation to vertex form, where (h,k) is the vertex, by completing the square.

The vertex lies on the axis of symmetry.

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