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NDA2012MathematicsQuadratic EquationActual

If one of the roots of the equation x^2+a x-b=0 is 1 , then what is (a-b) equal to?

Options

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

Correct answer

A. -1

Step-by-step solution

aligned & (1)^2+a(1)-b=0 & a-b=-1 aligned

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