To find f(3), we need to substitute 3 into the function f(x) = x² + 3x + 7.
So we have:
f(3) = (3)² + 3(3) + 7
Calculating this step by step:
1. (3)² = 9
2. 3(3) = 9
Now, we add these results together:
f(3) = 9 + 9 + 7
3. 9 + 9 = 18
4. 18 + 7 = 25
Therefore, f(3) = 25.