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      Question

      If a and b are the roots of x² + x – 2 = 0, then the

      quadratic equation in x whose roots are 1/a + 1/b and ab is
      A 2x² + 3x – 2 = 0 Correct Answer Incorrect Answer
      B 2x² – 5x + 2 = 0 Correct Answer Incorrect Answer
      C 2x² + 5x – 2 = 0 Correct Answer Incorrect Answer
      D 2x² – 3x + 2 = 0 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Find Roots of x2+x−2 = 0: Using the quadratic formula, the roots are: a=1,b=−2 Find New Roots: First root:

      Second root: ab = −2

      Find New Quadratic Equation:

      Sum of roots:

      Product of roots:

      Using the formula:

      Multiply by 2 to remove fraction:

      Practice Next
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