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Most Important Selected Qs for JEE AdvancedMathematicsQuadratic Equation

If , are the roots of x^2+a x+b=0 and ^2, ^2 are the roots of x^2+A x+B=0 , then

Options

  1. AA=2 b-a^2
  2. BB=b^2
  3. CA=2 b+a^2
  4. DB = a ^2

Correct answer

B. B=b^2

Step-by-step solution

Given, + =-a, =b and ^2+ ^2=-A, ^2 ^2=B Now, ^2+ ^2=( + )^2-2 a^2-2 b=-A So, A=2 b-a^2 Also, ^2 ^2=B aligned & (b)^2=B & B=b^2 aligned

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