Evaluate the Function f(x)=x^2+5x at x=4

$f (x) = x^{2} + 5 x$ at $x = 4$

Replace the variable $x$ with $4$ in the expression.

$f (4) = {(4)}^{2} + 5 (4)$

Simplify the result.

Simplify each term.

Raise $4$ to the power of $2$ .

$f (4) = 16 + 5 (4)$

Multiply $5$ by $4$ .

$f (4) = 16 + 20$

Add $16$ and $20$ .

$f (4) = 36$

The final answer is $36$ .

$36$