For the following questions answer them individually
I multiplied a natural number by 18 and another by 21 and added the products. Which one of the following could be the sum?
The product of two numbers is 45 and their difference is 4. The sum of squares of the two numbers is
$$\frac{2+\sqrt{3}}{2-\sqrt{3}}+\frac{2-\sqrt{3}}{2+\sqrt{3}}+\frac{\sqrt{3}+1}{\sqrt{3}-1}$$ =Â