A real value of x will satisfy the equation 3 - 4 i x 3 + 4 i x = α - i β   ( α , β…

A real value of x will satisfy the equation 3-4ix3+4ix=α-iβ (α,β are real), if
  1. α2-β2=-1
  2. α2-β2=1
  3. α2+β2=1
  4. α2-β2=2

Solution

Given, α-iβ=3+i(-4x)3+i(4x)

α+i-β=3+i(-4x)3+i(4x)

α+i-β=|3+i(-4x)||3+i(4x)|

α2+β2=32+-4x232+4x2

α2+β2=9+16x29+16x2 

α2+β2=1

Asked in: AP EAMCET 2021 (20 Aug Shift 2)

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