SOLUTION: f(x) = x2 + 2x - 9 is it max or min

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Question 931856: f(x) = x2 + 2x - 9
is it max or min
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
f(x) = x2 + 2x - 9
f(x) = (x+1)^2 - 1 - 9
f(x) = (x+1)^2 - 10 Parabola opening Up a = 1> 0
V(-1,-10) min
.....
the vertex form of a Parabola opening up(a>0) or down(a<0),
y=a%28x-h%29%5E2+%2Bk
where(h,k) is the vertex and x = h is the Line of Symmetry