How do I do number 2 also don’t pay attention to the pencil writing please

Statement Problem: Use synthetic and long division method to solve;
[tex](4x^4-15x^3-28x^2+6x+3)\div(x+4)[/tex]Solution:
By Synthetic division method;
Use the root associated with the divisor as;
[tex]\begin{gathered} x+4=0 \\ x=-4 \end{gathered}[/tex]Hence, the solution is;
[tex]4x^3-31x^2+96x-378+\frac{1515}{x+4}[/tex]By Long division method;
Hence, the solution is;
[tex]4x^3-31x^2+96x-378+\frac{1515}{x+4}[/tex]