(a²+b²)(-a²+b²) use sutable identy
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Answer:
(a² + b²) ( -a² + b² )
Rewrite it as , (b² + a²) (b² - a²)
Use the identity (a+b)(a-b) = a² - b²
here a = b² & b = a²
(b² + a²) (b² - a²)
= ( b²)² - ( a²)²
= b⁴ - a⁴
Verification:
(a² + b²) ( -a² + b² )
= a²( -a² + b² ) + b²( -a² + b² )
= -a⁴ + a²b² -a²b² + b⁴
= b⁴ - a⁴
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