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AP EAMCET2005MathematicsQuadratic Equation

The roots of the equation x^3-3 x-2=0 are

Options

  1. A-1,-1,2
  2. B-1,1,-2
  3. C-1,2,-3
  4. D-1,-1,-2

Correct answer

A. -1,-1,2

Step-by-step solution

Given equation is x^3-3 x-2=0 Now, put x=-1 , we get aligned (-1)^3-3(-1)-2 & =0 0 & =0 aligned Given equation can be written as aligned & (x+1) (x^2-x-2 )=0 & (x+1)(x+1)(x-2)=0 & x=-1,-1,2 & aligned

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