Solving gives \( x = 3 \).
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- \( 25^2 = 625 \), so it satisfies the theorem.
- Question:** If \( 2^{x+1} = 16 \), what is the value of \( x \)?
- So, \( 2^{x+1} = 2^4 \) implies \( x+1 = 4 \).
- Question:** The sum of the first \( n \) natural numbers is 210. Find \( n \).
- Solving \( n(n+1) = 420 \) gives \( n^2 + n - 420 = 0 \).
- Factoring: \( (n - 20)(n + 21) = 0 \).
