Step-by-step explanation:
a+b 2 - 1 x a-1 + b-1
a2 + b2 - 1 x -a+-b
ab2 -1 x -ab
ab x -ab
-ab2
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Step-by-step explanation:
a+b 2 - 1 x a-1 + b-1
a2 + b2 - 1 x -a+-b
ab2 -1 x -ab
ab x -ab
-ab2