Combine the like terms in the expression. drag the item from the item bank to its corresponding match. −12x4 + 7x3 + 6x4 − 2x3 add answer −5x3 + 7x4 + 4x4 − 8x3 add answer −2x4 − 10x3 + 4x4 − 2x3 add answer 15x3 − 15x4 + 13x4 − x3 add answer 7x4 − 15x3 + 12x3 − 2x4 add answer 11x^4 − 13x^3 14x^3 − 2x^4 2x^3 − 12x^3 5x^3 − 6x^4 5x^4 − 3x^3 no guessing or typing random letters!