Answer: use socratic you take a picture of the problem and it does it.
I think it would be something like this: x-80 = (x*2)+12
If a binomial x-a is a factor of a polynomial p(x), then p(a)=0.
x+2 is a factor of p(x)=x³-6x²+kx+10, so p(-2)=0.
D none of the above is the answer
So first sivid 42 by 3 to get 14. Then multiply 14 by 4 to get 56. So the answer is C