SOLUTION: Indicate the axis of symmetry of the parabola y = x^2 + 8x + 20

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Question 250565: Indicate the axis of symmetry of the parabola
y = x^2 + 8x + 20
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
Indicate the axis of symmetry of the parabola
y = x^2 + 8x + 20
.
Remember the quadratic formula?
%28-b+%2B-+sqrt%28b%5E2-4ac%29%29%2F%282a%29
.
Well, the axis of symmetry can be found by:
x+=+-b%2F%282a%29
The quadratic formula but without the +- radical.
.
x+=+-b%2F%282a%29
x+=+-8%2F%282%281%29%29
x+=+-8%2F2
x+=+-4 (axis of symmetry)