Question

If f(n) = n2 - n, then f(-4) is _____.
-20
20
12
-12

Answer 1

The correct option is "20" because

f(n)=n2−n
(−4)=(−4)2−(−4)
      =16+4
      =20

Answer 2

Answer:

The answer is 20.

Step-by-step explanation:

The answer of this question is applying the number -4 in the equation, this is:

$f(n)=n^{2} -n\\Replacing\\f(-4)=(-4)^{2} -(-4)\\f(-4)=16+4\\f(-4)=20$

The answer is 20.