4. Factorise :
(i) x³-2x²-x+2
(ii) x³-3x²-9x-5
(iii) x³+13x²+23x+20
(iv) 2y³+y²-2y-1​

1 thought on “4. Factorise :<br />(i) x³-2x²-x+2<br />(ii) x³-3x²-9x-5<br />(iii) x³+13x²+23x+20<br />(iv) 2y³+y²-2y-1​”

1. Step-by-step explanation:

   Answer

   i) x³–2x²–x+2

   = (x³–x)(2x²+2)

   =x(x²)+2(x²)

   =x²(x+2)

   ii) x³–3x²–9x-5

   = (–3x²–9x)(x³–5)

   = –3x(3x-3)(x³–5)

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