f(x)=3x3−19x+24f(x) = 3x^3 - 19x + 24f(x)=3x3−19x+24
Use the factor theorem to show that (x+3)(x + 3)(x+3) is a factor of f(x)f(x)f(x).
Solve the equation f(x)=0f(x) = 0f(x)=0.