What is the completely factored form of f(x)=x3+4x2+9x+36 ?
f(x)=(x+4)(x−3)(x+3)

f(x)=(x−4)(x−3i)(x+3i)

f(x)=(x+4)(x−3i)(x+3i)

f(x)=(x−4)(x−3)(x+3)