Question

if X + 4 is a factor of polynomial x cube + mx cube minus x + n then prove that 16 m + n is equals to 60

Answer 1

Question is wrong it is mx square
Then, put the value of x = -4
(-4)^3 + m(-4)^2 + 4+n
-64 + 16 m + 4+n
-60 + 16m + n
16m +n = 60
Hence proved