Question

How do you find `f(-1)` given `f(n)=-3n^2-4n`?

Answer 1

Just put -1 in n's place.

Explanation:

f(n)= -3n^2-4n
= -3(-1)^2 - 4(-1)
= -3(1) +4
= -3+4 = 1

Answer 2

f( -1) = 1

Explanation:

Given f(n) then f(-1) means assign the value -1 to n. That is substitute n = -1 into the function.

`f(n)=-3n^2-4n`

`rArrf(-1)=-3(-1)^2-4(-1)=-(3xx1)-(4xx-1)`

`=-3-(-4)=-3+4=1`