Choose one of the factors of x^3 + 343.

Answer

A. None of the above

B. x^2 + 7x + 49

C. x - 7

D. x^2 - 14x + 49

A factor is considered a root when we substitute the number and the equation is equal to zero. In this case, we can substitute each factor to the given equation above and check whether the equation results to zero. There are no equations resulting to zero. The factor should be x+7. Answer is A