Please I need an explanation and steps as soon as possible

(I've never done this before and I highly doubt I'm doing this right so forgive me for any wrong answer which might as well be all of them)

1. 5

2. 3

3. 2

4. 9

5. 4

6. 2

7. 8

8. 2

9. 11

10% of increase is the final answer! : )

- 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