Answer
$16-2x$
Work Step by Step
Step 1: $(4-\sqrt {2x})(4+\sqrt {2x})$
Step 2: $4(4+\sqrt {2x})-\sqrt {2x}(4+\sqrt {2x})$
Step 3: $16+4\sqrt {2x}-4\sqrt {2x}-(\sqrt {2x})^{2}$
Step 4: $16-2x$
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