f(x)=x^3+4 f=1, f=-1

Question

would the answer be 5 and 4? help Thought I knew this

Answer 1

f(x)=x^3+4
Not sure what you mean by f=1
would it be
f(1)=1^3+4=5
and
f(-1)=(-1)^3+4=-1+4=3

??