Question

Find the product of 3x^2+x-1 and 4x+5

a. 3x^2+5x+4
b. 12x^3+4x^2-4x
c. 12x^3+19x^2+x-5
d. 12x^3+19x^2+9x-5

Answer 1

12x^3 + 19x^2 +x - 5

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.