−21a2, −31a2 ,2a2
Explaination
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−21a2, −31a2 ,2a2 Explaination
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Answer:
(-21a2)+(-31a2)+(2a2) First put it in bracket
-*- =+
Then
(-51a4)+2a2
The sign is put always bigger in addition or subtraction
-*+=-
49a4 of negative is answer