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The roots of the equation | array ccc 1 & t-1 & 1 t-1 & 1 & 1 1 & 1 & t-1 array |=0 are

Options

  1. A1,2
  2. B-1,2
  3. C1,-2
  4. D-1,-2

Correct answer

B. -1,2

Step-by-step solution

aligned & .1(t-2)-(t-1)(t-1)^2-1 ]+1(t-2)=0 & (t-2)[1-(t-1)(t)+1]=0 & (t-2) (t^2-t-2 )=0 & (t-2)(t-2)(t+1)=0 & t=2, t=-1 aligned

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