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MHT CET202015 Oct 2020Evening ShiftMathematicsTrigonometric EquationsActual

If x+ ² x=1 , then ⁸ x+2 ⁶ x+ ⁴ x is

Options

  1. A3
  2. B2
  3. C1
  4. D4

Correct answer

C. 1

Step-by-step solution

Given x+ ² x=1 x=1- ² x aligned x= ² x ² x &= ⁴ x ⁸ x+2 ⁶ x+ ⁴ x &= ( ⁴ x+ ² x )² &= ( ² x+ ² x )²=1 aligned

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