Question

Find f(-5) if f(n) = n3 + 3n2
A) -50
B) -7
C) 0
D) 22

Answer 1

f(n) = n^3 + 3n^2
​substitute the f(-5)
​f(-5) = (-5)^3 + 3(-5)^2
solve
f(-5) = -125 + 75
f(-5) = -50

​That is the solution
​A.) -50

​Hope this helps :)

Answer 2

`f(-5) = (-5)^(3) + 3(-5)^(2)`

`f(-5) = -125 + 3(25)`

`f(-5) = -125 + 75`

`= -50`