Answer
$(x+7y)(x-11y)$
Work Step by Step
Step 1: $x^{2}-4xy-77y^{2}$
Step 2: $x^{2}+7xy-11xy-77y^{2}$
Step 3: $x(x+7y)-11y(x+7y)$
Step 4: $(x+7y)(x-11y)$
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