Question : Simplify the expression: $(2x+13-y)(2x-13-y)$
Option 1: $4x^2-y^2-4xy-169$
Option 2: $4x^2+y^2+4xy-169$
Option 3: $4x^2+y^2-4xy-169$
Option 4: $4x^2+y^2-4xy+169$
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Correct Answer: $4x^2+y^2-4xy-169$
Solution : $(2x+13-y)(2x-13-y)$ $=[(2x-y)+13][(2x-y)-13]$ $=(2x-y)^2-13^2$ $=4x^2+y^2-4xy-169$ Hence, the correct answer is $4x^2+y^2-4xy-169$.
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