(a²+b)(- a² +b²) find the identity
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( a² + b² ) ( - a² + b² )
Rearrange the terms
= ( b² + a² ) ( b² - a² )
Apply ( b + a ) ( b - a ) = b² - a²
= ( b² )² - ( a² )²
Evaluate the exponents :
b⁴ - a⁴
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