If 3 + 2 = 13, 4 + 3 = 25, then 5 + 4 = ?
41
Pattern: a + b = \(a^2 + b^2\).
\(3^2 + 2^2 = 9 + 4 = 13\) ✓
\(4^2 + 3^2 = 16 + 9 = 25\) ✓
\(5^2 + 4^2 = 25 + 16 = 41\).
Hence the answer is 41.
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