JEE AdvancedMathematicsQuadratic Equation and InequalitiesMCQ+3 / −0.75
Let and be real numbers such that and If and are nonzero complex numbers satisfying and then a quadratic equation having and as its roots is
- A
- B
- C
- D
View written solutionFree
Correct answer: B
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Given and we need the quadratic whose roots are
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Use the identity for sum of cubes Substituting the given values, So, Hence, and therefore
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Form the sum of the required roots Let Then
Also,
Now, Thus,
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Substitute Since we get Therefore, r_1+r_2=\frac{3p^3}{p^3+q}-2=rac{3p^3-2(p^3+q)}{p^3+q}=rac{p^3-2q}{p^3+q}.
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Write the quadratic For roots , the quadratic is Hence, Multiplying by ,
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Match with the options This is exactly Option B.
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Verification with stored answer Stored correct answer: B
Derived answer: B
So the derived answer agrees with the stored answer.
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