(√(34) + √(46))^2 / 20 + √(391)

[latex]( \sqrt{34} + \sqrt{46} )^2/20+ \sqrt{391} =( 34 +2 \sqrt{1564}+ 46 )^2/20+ \sqrt{391}=[/latex] [latex]=( 80 +4\sqrt{391})/20+ \sqrt{391}=4+ \frac{\sqrt{391}}{5}+\sqrt{391}=4+\frac{\sqrt{391}+5\sqrt{391}}{5}=[/latex] [latex]=4+\frac{6\sqrt{391}}{5}=4+1.2\sqrt{391}[/latex]