Simplify the expression (x^4 + 4x^3 - 5x - 20) ÷ (x + 4) using synthetic division. After doing the synthetic division, which gives you just coefficients. Convert the coefficient quotient answer, into a polynomial with variable x and the correct exponent powers in it. Convert your coefficient answer into a polynomial. Hint: remember to fill in any missing degree terms in your dividend with coefficients that are zero to represent missing place holders. Show your work.