Let $\#$ be the relation defined by $A \# B = A^2 + B^2$. If $A \# 5 = 169$, what is the positive value of $A$?
Question:
Let $\#$ be the relation defined by $A \# B = A^2 + B^2$. If $A \# 5 = 169$, what is the positive value of $A$?
Answer:
Let's think step by step.

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Let $\#$ be the relation defined by $A \# B = A^2 + B^2$. If $A \# 5 = 169$, what is the positive value of $A$?
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