Divide the polynomials using long or synthetic division
{(x^{4}-2x^3-23x^2+37x+15)\div(x-5)}
{(x^4+11x^3+23x^2-45x-18)\div(x+6)}
{(x^3-4x^2+3x+2)\div(x-2)}
{(8x^3-79x^2-74x-8)\div(8x+1)}