Complete each problem using 'Factoring by Grouping'.
2x^3 + 3x^2 + 2x + 3
5x^3 + 25x^2 + x + 5
14y^4 + 10y^3 - 7y - 5
2x^3 + 7x^2 - 10x - 35
5y^4 + 2y^3 + 20y + 8