[tex]\huge\blue{\boxed{\tt{\colorbox{pink}{b: x²y²-1}}}}[/tex]
[tex] \\ \\ [/tex]
Use (a-b)(a+b)=a²-b² to simplify the product
( xy - 1)( xy + 1 )
↓
(xy)²-1²
To rase a product to a power, raise each factor to that power
(xy)²-1²
↓
x²y²-1²
↓
x²y²-1
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[tex]\huge\blue{\boxed{\tt{\colorbox{pink}{Final Answer}}}}[/tex]
[tex]\purple{\boxed{\tt{\colorbox{pink}{x²y²-1}}}}[/tex]
