Can someone help me please

1) B/second one

2) ???

3) C/third one

Step-by-step explanation:

1) Factoring out a number means taking out the number both sets have in common (23) so it becomes (59+21)*23.

2) What's in the sets???

3) Replace x with 8 to get 18-8=10

- 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