To find \( h(3) \) given the function \( h(x) = -5x - 3 \), we substitute \( x = 3 \) into the function.
\[ h(3) = -5(3) - 3 \]
Calculating this step by step:
- Calculate \( -5(3) = -15 \).
- Then, add \( -3 \):
\[ h(3) = -15 - 3 = -18 \]
Thus, \( h(3) = -18 \).
So, the final answer is:
\[ h(3) = -18 \]