Let α and β be the roots of the equation x 2 + 2 i - 1 = 0 . Then, the value of α 8 + β…

Let α and β be the roots of the equation x2+2i-1=0. Then, the value of α8+β8 is equal to
  1. 50
  2. 250
  3. 1250
  4. 1550

Solution

Since α and β are the roots of the equation x2+2i-1=0

so α2=-2i+1=β2

α4=-2i+12=4i2+1-4i=-3-4i

α8=-3-4i2=-7+24i

Similarly, β8=-7+24i

α8+β8=-14+48i=50

Asked in: JEE Main 2022 (29 Jun Shift 1)

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