Question

what is the answerrrrrr expand the polynomial (a-1)(a-4)(a+5)

Answer 1

Answer:

= a³ + 4a² - 21a + 20

Step-by-step explanation:

(a-1)(a-4)(a+5)

= (a² - 4a - a + 4)(a+5)

= (a² - 5a + 4)(a+5)

= “a³ - 5a² + 4a + 5a² - 25a + 20

= a³ - 21a + 20