Question

Please help asap 50 pts

Answer 1

id go with b honestly

Answer 2

`k^2+5kf-50f^2=k^2+10kf-5kf-50f^2\\\\=k(k+10f)-5f(k+10f)=(k+10f)(k-5f)\\\\\boxed{Answer:\ A.\ (k+10f)(k-5f)}`