Final Answer
Step-by-step Solution
Specify the solving method
We can multiply the polynomials $\left(xy-1\right)\left(xy+1\right)$ by using the FOIL method. The acronym F O I L stands for multiplying the terms in each bracket in the following order: First by First ($F\times F$), Outer by Outer ($O\times O$), Inner by Inner ($I\times I$), Last by Last ($L\times L$)
Learn how to solve special products problems step by step online.
$\begin{matrix}(F\times F)\:=\:(xy)(xy)\\(O\times O)\:=\:(xy)(1)\\(I\times I)\:=\:(-1)(xy)\\(L\times L)\:=\:(-1)(1)\end{matrix}$
Learn how to solve special products problems step by step online. Solve the product (xy-1)(xy+1). We can multiply the polynomials \left(xy-1\right)\left(xy+1\right) by using the FOIL method. The acronym F O I L stands for multiplying the terms in each bracket in the following order: First by First (F\times F), Outer by Outer (O\times O), Inner by Inner (I\times I), Last by Last (L\times L). Then, combine the four terms in a sum. Substitute the values of the products. Multiply -1 times 1.