Use polynomial fitting to find the formula for the nth term of the sequence (an), 20 which starts, 0, 1, 7, 21, 46, 85, ... an 3 - 6n-+ 1In -6 X Use polynomial fitting to find the formula for the nth term of the sequence (an),. >0 which starts, 1, 2, 7, 18, 37, ... an19.83x^3+13.4x-.815494393=0 Solve for x