Question 355717
Where exactly are you having difficulty??
It should be pretty straightforward.
Look for numbers that add to {{{18}}}. 
Then square them and add them.
({{{9}}},{{{9}}})->{{{81+81=162}}}
({{{10}}},{{{8}}})->{{{100+64=164}}}
({{{11}}},{{{7}}})->{{{121+49=170}}}