Q. Given that and are roots of the equation , find a quadratic equation with integer coefficients whose roots are and

My working for this question basically gave me a wrong answer although i see it as perfectly ok. I basically used the quadratic formula and got and then i divided each one by 2 again giving the same answer but over 4. Then i just made brackets using the answer and got: which expands to give But the answer im supposed to get is which i can't get. I f anyone could see whats wron with my method and show me how to get the right answer that'd be great unfortunatley my notes arent eith me atm thnx