Roots of quadratic equation

roots_of_quadratic_equations.rb

# Roots of quadratic equation
#
# $ ruby roots_of_quadratic_equations.rb
# Equation will be in the format : ax^2 + bx + c
# Enter the value of a :
# 2
# Enter the value of b :
# 3
# Enter the value of c :
# 4
# Roots are imaginary
# Roots are -4+4.8i, -4-4.8i

class QuadraticEquationRoots
  def initialize
    puts "Equation will be in the format : ax^2 + bx + c"
    puts "Enter the value of a :" 
    a = gets.strip.to_i
    puts "Enter the value of b :" 
    b = gets.strip.to_i
    puts "Enter the value of c :" 
    c = gets.strip.to_i
    roots_of_quadratic_equations(a, b, c)
  end

  def roots_of_quadratic_equations(a, b, c)
    d = ((b*b) - (4*a*c))
    root_d = Math.sqrt(d.abs).round(2)
    if d > 0 
      puts "Roots are real and different"
      x1 = (-b + root_d)/ 2*a
      x2 = (-b - root_d)/ 2*a
      puts "Roots are #{x1.round(2)} and #{x2.round(2)}"
    elsif d == 0
      puts "Roots are real and same"
      x1 = -b / 2*a
      puts "Roots are #{x1}"  
    else
      puts "Roots are imaginary"
      puts "Roots are #{-b/2*a}+#{root_d/2*a}i, #{-b/2*a}#{-root_d/2*a}i"
    end     
  end
end

roots = QuadraticEquationRoots.new