Final answer:
The function that increases without bound as x approaches negative and positive infinity is the one that has a positive leading coefficient and the highest power of x.
Step-by-step explanation:
The function that increases without bound as x approaches negative and positive infinity is the one that has a positive leading coefficient and the highest power of x.
After analyzing the given options, f(x)=4x(x+1)(x+1)(x+2) is the correct answer because it has a positive leading coefficient (4) and the highest power of x (x^3), which means it increases without bound as x approaches negative and positive infinity.