I have a ^2√31+^2√43/(17)^2 I haven't been succesful on put it in a calculator.
+118724 ^2√31+^2√43/(17)^2
Is this what you want?
$$\sqrt{31}+\sqrt{43}/(17)^2$$
Most calcs including the Web2 calc have a $${\sqrt{{\mathtt{x}}}}$$ button.
so you just press
$$31\;\;\sqrt{x}\;\;+\;\;43\;\;\sqrt{x} \;\;\div\;\;17 \;\;x^2=$$
Or for the web2 calc I would write this in the input box
sqrt(31)+sqrt(43)/17^2 and then press equals. This is what the output would look like
$${\sqrt{{\mathtt{31}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\sqrt{{\mathtt{43}}}}}{{{\mathtt{17}}}^{{\mathtt{2}}}}} = {\mathtt{5.590\: \!454\: \!461\: \!530\: \!028\: \!8}}$$
There are other ways as well because a square root is the same as a power of 1/2
but that is enough for now 
+118724 ^2√31+^2√43/(17)^2
Is this what you want?
$$\sqrt{31}+\sqrt{43}/(17)^2$$
Most calcs including the Web2 calc have a $${\sqrt{{\mathtt{x}}}}$$ button.
so you just press
$$31\;\;\sqrt{x}\;\;+\;\;43\;\;\sqrt{x} \;\;\div\;\;17 \;\;x^2=$$
Or for the web2 calc I would write this in the input box
sqrt(31)+sqrt(43)/17^2 and then press equals. This is what the output would look like
$${\sqrt{{\mathtt{31}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\sqrt{{\mathtt{43}}}}}{{{\mathtt{17}}}^{{\mathtt{2}}}}} = {\mathtt{5.590\: \!454\: \!461\: \!530\: \!028\: \!8}}$$
There are other ways as well because a square root is the same as a power of 1/2
but that is enough for now
