Question

factorise: 3³-3x²-9x-5​

Answer 1

Step-by-step explanation:

3²-3x-9x-5

3*3*3-12x-5

27-5-12x

12x=22

x=11/6

Answer 2

by a direct checking

f(5)=0 where f(x) = x³-3x²-9x-5

thus,f(x) = x²(x-5) + 2x(x-5) + (x-5)

= (x-5) (x²+2x+1)

=(x-5)(x+1)²