Answer:
B.
Step-by-step explanation:
To factor trinomials, you need two numbers that multiply together to give you the third term and add together to give you the second term.
What are two factors that multiply to get 42 and add to get 13? These factors are 6 and 7.
Write the factorization as such:
(x+7)(x+6)
(x+7) is choice B.
