Question 76279: I really need some help with this. Please. Find the axis of symmetry.
Y = x^2 + 5x -9
Thanks
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Find the axis of symmetry.
Y = x^2 + 5x -9
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There are at least two ways to do this:
1st: Find the x-value of the max point at x=-b/2a
x=-5/2
That is the axis of symmetry.
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2nd: Put in vertex form:
y+9 = x^2+5x
Complete the square to get:
x^2+5x+(5/2)^2 = y+9+(5/2)^2
Factor to get:
(x+(5/2))^2 = y+(61/4)
This tells you the vertex is at ((-5/2),(-61,4))
Axis of symmetry is x=-5/2
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Cheers,
Stan H.
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