3 (4x + 7) = 43; 12x + 21 = 43 O Commutative Property
Associative Property
O Addition Property
O Distribution Property

Distributive property

Explanation:

You are distributing the 3 to the parenthesis to get 12x+21 =43

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form