Answer
$25-16y^{2}$
Work Step by Step
Step 1: $(5+4y)(5-4y)$
Step 2: Using a special product to multiply, $(5+4y)(5-4y)=(5)^{2}-(4y)^{2}$
Step 3: $(5)^{2}-(4y)^{2}=25-16y^{2}$
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