your symbols came out strange on my computer
did you mean 4√8 - 2√2 ??
if so, then ...
= 4√4√2 - 2√2
= 8√2 - 2√2
= 6√2
or
4√8 - √8
= 3√8
= 3(2√2) = 6√2
subtract and simplify by collecting like radical terms if possible
4�ã8-2�ã2
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