Final answer:
To factor the expression (21x² + 55x + 14), we can use the distributive property and expand the binomial expression. The correct factorization is: (3x + 7)(7x + 2).
Step-by-step explanation:
To factor the expression (21x² + 55x + 14), we need to find the two binomials that, when multiplied, give us the original expression. We can do this by using the distributive property and expanding the binomial expression. The correct factorization is: (3x + 7)(7x + 2).