Please re-post your question. You have two terms. If this is correct, then they cancel each other out and your expression is
. Post this simplified expression.
But I suspect that the first term has an exponent higher than 4 since polynomials are usually written in order from highest exponent to lowest.
P.S. According to your note, you posted the problem correctly. We should start then by simplifying to which we will now divide by m-4 using synthetic division:
4 } -1 1 0 0 5 <== two zeros for the missing x^2 and x terms
=== -4 -12 -48 -192
=======================
-1 -3 -12 -48 -187
which matches what you got with long division.