Answer
\[33\]
Work Step by Step
Put \[x=4\]in the given expression and simplify it as follows:
\[\begin{align}
& 6x+9=6\left( 4 \right)+9 \\
& =24+9 \\
& =33
\end{align}\]
Hence, the algebraic expression \[6x+9\] evaluated at \[x=4\]gives\[33\].
