input: Write a python function to solve the quadratic equation x^2 - 3x + 2 and return the roots.
  assert solve_quadratic_equation() == [1.0, 2.0]
output: def solve_quadratic_equation():
      a = 1
      b = -3
      c = 2
      discriminant = b**2 - 4*a*c
      root1 = (-b + discriminant**0.5) / (2*a)
      root2 = (-b - discriminant**0.5) / (2*a)
      return [root2, root1]