It is given that f(x)=x3+2x2−11x−12f(x) = x^3 + 2x^2 - 11x - 12f(x)=x3+2x2−11x−12
Calculate f(−4)f(-4)f(−4) and state what this establishes about f(x)f(x)f(x).
Hence factorise f(x)f(x)f(x) completely.