sqrt18 + sqrt128
If we want an "exact" answer, we have
√18 +√128 =
√(9*2) + √(64*2) =
3√(2) + 8√(2) =
11√2
√18 + √128 = 15.55634919 <---- Exact | Round or cut off ----> 15.556
Who's correct? CPhill or therealQuestioner?
+95 
