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The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: $(a+b)(a-b)=a^2-b^2$.
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$\left(a^2-1\right)\left(a+2\right)\left(a-2\right)$
Learn how to solve special products problems step by step online. Solve the product (a+1)(a-1)(a+2)(a-2). The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: (a+b)(a-b)=a^2-b^2.. Solve the product of difference of squares \left(a^2-1\right)\left(a+2\right)\left(a-2\right). We can multiply the polynomials \left(a^2-4\right)\left(a^2-1\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.