Question

4 x elevado a 4 - 5 x elevado a 2 + 1 = 0

Answer 1

4 x⁴ - 5 x² + 1 = 0
x² (4x² -5) + 1 = 0

x² + 1 = 0
x² = -1
x  = √-1

4x² -5 = 0
4x² = 5
  x² = 5/4
  x  = √5/4