Q54 / 160 · AP EAMCET 2018 (22 Apr Shift 2) · Mathematics

The minimum degree of a polynomial equation with rational coefficients having $\sqrt{3}+\sqrt{27}, \sqrt{2}+5 i$ as two of its roots is

  • A
    8
  • Correct answer
    B
    6
  • C
    4
  • D
    2

Solution

The polynomial equation with rational coefficients having $\sqrt{3}+\sqrt{27}, \sqrt{2}+5 i$ as two roots. Then, other roots are $$ \begin{aligned} & \sqrt{3}-\sqrt{27} \text { and } \sqrt{2}-5 i \\ & -\sqrt{3}+\sqrt{27} \text { and }-\sqrt{3}-\sqrt{27} \end{aligned} $$ Therefore, number of roots are 6 and the minimum degree of a polynomial equation having 6 distinct roots is 6 .

Hence, the correct answer is option: 'B'.

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