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

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

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

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

Simplify the result.

Remove parentheses.

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

Simplify each term.

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

$f (- 4) = 5 \cdot 16 - 4$

Multiply $5$ by $16$ .

$f (- 4) = 80 - 4$

Subtract $4$ from $80$ .

$f (- 4) = 76$

The final answer is $76$ .

$76$