(vi) (a² + b²)(-a² +b²)
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Answer:
a^2 (-a^2 + b^2) + b^2(-a^2+b^2)
-2a^2+ab^2 - ab^2 + 2b^2
-2a^2 + 2b^2
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1
(A²-B²) = (A-B)² + 2AB......
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