I want to know how toHow can we establish algebraically if $\sqrt{2}\sqrt{3}$ is greater than or less than $\sqrt{2} + \sqrt{3}$.?
I know I can plug the values into any calculator and compare the digits, but that is not very satisfying.
I've tried to solve $$ \sqrt{2}+\sqrt{3}+x=\sqrt{2}\sqrt{3} $$$$\sqrt{2}+\sqrt{3}+x=\sqrt{2}\sqrt{3} $$ to see if $x$ is positive or negative. But I'm just getting sums of square roots whose positive or negative values are not obvious.
Can it be done without the decimal expansion?