Final answer:
To find f(-4) for the function f(n) = n^2 - n, simply substitute n with -4. The calculation is (-4)^2 - (-4), which simplifies to 16 + 4, giving us f(-4) = 20.
Step-by-step explanation:
If we want to calculate f(-4) for the function f(n) = n2 - n, we substitute n with -4. So, we calculate f(-4) = (-4)2 - (-4). First, we evaluate (-4)2, which is 16, because a negative number raised to an even power gives a positive result. Then, we compute the subtraction of -4, which turns into addition due to the minus sign before the negative number. Therefore, the resulting calculation is 16 + 4 = 20, so f(-4) = 20.