Find the intervals on which y = (x +4)^2 - 7 is increasing or decreasing

I have never had a problem like this i don't know what to do please help

thank you!

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- August 6th 2007, 01:41 PMaikenfanincreasing decreasing
Find the intervals on which y = (x +4)^2 - 7 is increasing or decreasing

I have never had a problem like this i don't know what to do please help

thank you! - August 6th 2007, 02:16 PMaikenfan
where did the 9 come from?

- August 6th 2007, 02:27 PMtopsquark
- August 6th 2007, 02:29 PMtopsquark
Actually there's a quicker way. A (vertical) parabola has the form:

where the vertex is at (h, k) and it opens upward if a > 0 and opens downward if a < 0.

So the vertex of is at (-4, -7) and a = 1. Thus it opens upward. So it must be decreasing on and increasing on .

-Dan