Answer:
Answer is option B. (8+7x)
Explanation:
In these questions we always simplify the equation to get the value of missing factor.
We assume that the missing factor is y.
The given equation is (64-49
)=(y)(8-7x)
-
=(y)(8-7x)
(8-7x)(8+7x) = (y)(8-7x)
y =

y = (8+7x)