
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Let the function $f(x)$ be an odd function defined on $\mathbb{R}$. It is known that for $x > 0$, $f(x) = -(x+1)^2$.
(Ⅰ) Find the explicit expression of the function $f(x)$;
(Ⅱ) If $f(m^2+2m) + f(m) > 0$, find the range of $m$.

Present the answer in LaTex format: \boxed{Your answer}
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