Question

Multiply the given polynomials. Answers should be simplified and written in standard form.

(a-9)(a+4)

Answer 1

a² - 5a - 36

Explanation:

(a - 9)(a + 4)

each term in the second factor is multiplied by each term in the first factor, that is

a(a + 4) - 9(a + 4) ← distribute parenthesis

= a² + 4a - 9a - 36 ← collect like terms

= a² - 5a - 36