The polynomial f(x)f(x)f(x) is defined by f(x)=2x3+9x2−6x−5f(x) = 2x^3 + 9x^2 - 6x - 5f(x)=2x3+9x2−6x−5
Show that f(1)=0f(1) = 0f(1)=0
Solve the equation f(x)=0f(x) = 0f(x)=0