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AP EAMCET2002MathematicsQuadratic Equation

If , , are the roots of 2 x^3-2 x-1=0 , then ( )^2 is equal to

Options

  1. A-1
  2. B1
  3. C2
  4. D3

Correct answer

B. 1

Step-by-step solution

, and are the roots of the equation array rlrl 2 x^3-2 x-1 & =0 or & 2 x^3+0 x^2-2 x-1 & =0 & + + = (-2) 2 & =-1 Now, ( )^2=( + + )^2 & =(-1)^2=1 array

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