Answer:
x^3 -3x^4 - 9x -5
choose the highest common factor for
x^3 and 3x^4. which is x^3 and note that the number within the bracket must be factorized up to the lowest point so that they cannot be factorized no more.
x^3 -3x^4 - 9x -5
x^3(1-3x) - 9x-5. ......(1-3x) is in
simplest form
>>x^3(1-3x) - 9x-5
