Question

Find f(4) when f(x)=4x^2 - 2 x - 4

Answer 1

Answer:

52

Step-by-step explanation:

$f(x)=4x^2-2x-4$

$f(4)=4(4)^2-2(4)-4$ (I replaced $x$ with $(4)$ since we are to find $f(4)$.)

$f(4)=4(16)-2(4)-4$    (By the order of operations, we take care of the exponents before whatever else we have here.)

$f(4)=64-8-4$           (By the order of operations, we take care of the multiplication as we see if left to right.)

$f(4)=56-4$              (By the order of operations, we perform addition/subtraction as we see it left to right.)

$f(4)=52$                 (This completes the simplification.)

We could have also put this in our calculator as:

4(4)^2 -  2(4)  -  4

This would have returned 52.