
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
Evaluate the expression $(7-\sqrt{x^2 - 49x + 169})^2$.
A) $x^2 - 49x + 218$  
B) $x^2 - 49x + 218 - 14\sqrt{x^2 - 49x + 169}$  
C) $x^2 - 49x + 218 + 14\sqrt{x^2 - 49x + 169}$  
D) $49 - 14\sqrt{x^2 - 49x + 169} + x^2 - 49x$  
E) $x^2 - 49x + 169$

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