Question

C) (f + a)(ƒ +9) (f - 4) = f³ +7f²-26f - 72
Without fully expanding the brackets. Find a

Answer 1

a = 2

Explanation:

the constant terms inside the factors will multiply to give the constant term of the expansion, that is

a × 9 × - 4 = - 72

- 36a = - 72 ( divide both sides by - 36 )

a = 2