(a²+b²) (-a²+b²)
Solve the equation using identites
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S O L U T I O N:-
⇒(a²+b²)(-a²+b²) Since (a+b)(a-b)=a²-b²
Therefore,
⇒(b²+a²)(b²-a²)=(b²)²-(a²)²
⇒b⁴-a⁴
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