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Find the intervals in which f(x)=-x^2-2x...

Find the intervals in which `f(x)=-x^2-2x+15` is increasing or decreasing.

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`f'(x)=-2x-2=0=>x=-1`
For `x in (-oo, -1)` function is increasing.
For `x in (-1, oo)` funciton is decreasing.
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