Answer
$12\sqrt 2$
Work Step by Step
$4\sqrt 32-2\sqrt8=4\sqrt (16\times2)-2\sqrt (4\times2)=4\times\sqrt 16\times\sqrt 2-2\times\sqrt 4\times\sqrt 2=4\times4\times\sqrt 2-2\times2\times\sqrt 2=16\sqrt 2-4\sqrt 2=12\sqrt 2$
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