Question

simplify (a²-b²)(a²+b²)-(a²-b²)²​

Answer 1

$(a {}^{2} - b {}^{2} ) \times \: (a {}^{2} + b {}^{2} - a {}^{2} + {b}^{2} ) \\ = ( {a}^{2} - {b}^{2} ) \times 2 {b}^{2} \\ = 2 {a}^{2} b {}^{2} - 2 {b}^{4}$

I got the first step by taking the common factor a2-b2

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