Which are the like terms in 5x3 + 3x2 – x + x3? 5x3and x3 5x3and 3x2 5x3, 3x2, and x3 they are all like terms. 2. simplify: 4x3 – 3x2 + x + 3x3 7x6– 3x2+ x 4x3– 3x2+ x + 3x3 (the expression cannot be simplified) 7x3– 3x2+ x 5y3 3. simplify: 6y + 5z + 8y – 3z 11y + 5z 14y + 2z 14y + 8z 16yz