io.write("Enter a:")
local a = tonumber(io.read())

io.write("Enter b: ")
local b = tonumber(io.read())

io.write("Enter c: ")
local c = tonumber(io.read())

if a == 0 then
	print("This is not a quadratic equation")
else
	local d = b^2 - 4*a*c
	if d < 0 then 
		print("No real solution") 
	elseif d == 0 then 
		local x = -b / (2*a)
		print("One real solution: x = " .. x)
	else 
		local x1 = (-b + math.sqrt(d)) / (2*a)
		local x2 = (-b - math.sqrt(d)) / (2*a)
		print("Two real solutions: x1 = " .. x1 .."x2 = " .. x2 )
	end
end