Engineering
Mathematics
Introduction to Determinants
Question

f(x)=x2(x1)2x3x1x2(x+1)3x(x+1)2(x+2)3

0

2

– 2

None of these
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Solution
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f(x)=x2(x1)2x3x1x2(x+1)3x(x+1)2(x+2)3

=x2x2+12xx3x1x2x3+3x2+3x+1xx2+2x+1x3+6x2+12x+8

=x2x2+12xx312x13x2+3x+124x6x2+12x+8

(∵  R2 → R2 – R1

      R3 → R3 – R1)

=2x2x22x+1x312x13x2+3x+1018x+3

 (∵  R3 → R3 – 2R2)

= 2[(– 2)(6x2 + 3– 3 – 3x2 – 3– 1)] – 3(– 1)2(+ 1) + x3]

= 2[x3 – 3x2 – + 5]

∴ f(x) = 2x3 – 6x2 – 2+ 10

 Coefficient of x is – 2 [option C]

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