
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 $\{a_n\}$ be a geometric sequence with a positive common ratio, $a_1=2$, $a_3=a_2+4$,

(1) Find the general formula for $\{a_n\}$;  
(2) Let $\{b_n\}$ be an arithmetic sequence with the first term equal to 1 and a common difference of 2, find the sum of the first $n$ terms $S_n$ of the sequence $\{a_n+b_n\}$.

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