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To make 3a²b²-5ab to 5a²b²+a²b²= 6a²b²
6a²b² - ( 3a²b²-5ab )= 3a²b² +5a
we have to add 3
a²b² +5ab
1 5 1
hope it helps
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what must be added to 3a²b²-5ab to make 5a²b²+a²b²  ?

 3a²b² +5ab