Factorise x3-3x2-9x-5
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Step-by-step explanation:
x² -4x -5
x+1√x³-3x²-9x-5 f(-1)=0
x³+x² ∴x+1 is a factor.
-4x²-9x-5
-4x²-4x ∴x²-4x-5=(x+1)(x-5)
-5x-5 ∴f(x)=(x+1)²(x-5)
-5x-5
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