Question

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

Answer 1

The answer is 20.

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.

Answer 2

The correct option is "20" because

f(n)=n2−n
(−4)=(−4)2−(−4)
=16+4
=20