Answer :

If it is, then [tex]f(4)[/tex] would be equal [tex]0[/tex].

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

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