f(x)=x−2(x−1)2x3x−1x2(x+1)3x(x+1)2(x+2)3
– 2
0
2
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=x−2x2+1−2xx3x−1x2x3+3x2+3x+1xx2+2x+1x3+6x2+12x+8
=x−2x2+1−2xx312x−13x2+3x+124x6x2+12x+8
(∵ R2 → R2 – R1
R3 → R3 – R1)
=2x−2x2−2x+1x312x−13x2+3x+1018x+3
(∵ R3 → R3 – 2R2)
= 2[(x – 2)(6x2 + 3x – 3 – 3x2 – 3x – 1)] – 3(x – 1)2(x + 1) + x3]
= 2[x3 – 3x2 – x + 5]
∴ f(x) = 2x3 – 6x2 – 2x + 10
∴ Coefficient of x is – 2 [option C]