find the product of 3x^2+x-1 and 4x+5a. 3x^2+5x+4b. 12x^3+4x^2-4xc. 12x^3+19x^2+x-5d. 12x^3+19x^2+9x-5

Answer:12x^3 + 19x^2 +x - 5  Step-by-step explanation:(3x^2 + x - 1 ) (4x + 5)12x^3 + 15x^2  + 4x^2 + 5x - 4x - 5           use the Distributive                                                                       Property* to  multiply                                                                   each term by each other                                                                   term.12x^3 + 19x^2 +x - 5                                  simply*Distribute the first number to 4x, and then by 5. Then distribute x to 4x and 5, and distribute -1 to 4x and 5. By distribute I mean multiply.