To find \( f(5) \) for the function \( f(x) = x^2 + 2x \), we can substitute \( x \) with 5:
\[ f(5) = 5^2 + 2 \cdot 5 \]
Calculating \( 5^2 \):
\[ 5^2 = 25 \]
Calculating \( 2 \cdot 5 \):
\[ 2 \cdot 5 = 10 \]
Now, adding these results together:
\[ f(5) = 25 + 10 = 35 \]
So, \( f(5) = 35 \).
The correct answer is: D 3535.
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