I ned help

A) 4x + 12

B) 16x + 48

C) Yes.

Step-by-step explanation:

For part A, the distributive property is when you multiply all the numbers in the parentheses by the number that is right next to the parentheses. So, the equation would become; 4x + 12.

For part B, you just double everything by multiplying it by 2. So instead of 4(x + 3) it would be 8(2x + 6). So, now we do the distributive property again and we come out with 16x + 48.

For part C, it is correct because x has also been multiplied by 2, so if none of the numbers change, it would be exactly the same. I hope this helps. Please mark me brainliest!

- 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