Help with result printing

Hello there people!I'm writing the quadratic equation to scheme lisp and i need some help with the results printing:

1)If i define some calculations to the variable a,how do i print the result of the calculations that is stored to a?

2)If the result is a cons then how do i print the cons ?

I tried the display command but i cannot make it work. :/

Please answer me as soon as possible!

Thank you in advance.

Could you post the code you are using?

I finally managed to correct my code: A was using uneeded parenthesies!