Replace f(x) in the equation with what it equals:

Distribute 4 to each term in parentheses:



The answer is
C.
Im pretty sure its 8y because two negatives equal a positive so 5 plus 3 and then you isolated the y so 8y. :)
A factor of 14 is 7, and it isnt a multiple of 2.
7 x 2 = 14