Verified Answer :

If it is, then \(f(4)\) would be equal \(0\).

\(f(4)=4^3+11\cdot4^2+24\cdot4-36\\ f(4)=64+11\cdot16+96-36\\ f(4)=124+176\\ f(4)=300 ot =0 \Rightarrow \text{ it isn't}\)