Factorise: x3-3x2-9x-5.
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F(1)=x3_3x2-9x-5
=-16
F(-1)=x3 -3x2-9x-5
=0
Therefore f(-1)= 0
It is the factor .
(X+1) is the factor .
Divide it with x3-3x2-9x-5
Dividend =divisor ×quotient +remainder .
=(X+1)(x2 -4x -5)
=(X-5) (x+1) (x-1).
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