Multiplying Expressions: Use a vertical format to find the product. What is (a - 3)(a^2 - 4a - 6)?

Question 1
a³ - 4a² - 6a
__- 3a² +12a + 18

a³ - 7a² + 6a + 18

Question 2
x³ - 2x² + 3x
___4x² - 8x + 12

x³ + 2x² - 5x + 12

1)
(a - 3)(a^2 - 4a - 6)
= a^3 - 3a^2 - 4a^2 + 12a - 6a + 18
= a^3 - 7a^2 + 6a + 18

2)
(x + 4)(x^2 - 2x + 3)
= x^3 + 4x^2 - 2x^2 - 8x + 3x + 12
= x^3 + 2x^2 - 5x + 12

a^3-7a^2+18a+18