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5 votes
3b2 − = -9b2\

-6b^2
-9b^2
12b^2

User Schacki
by
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1 Answer

4 votes
3b2 − ? = -9b2
so
3b2 − 12b^2 = -9b2

answer

12b^2
User Stephen Lead
by
7.7k points

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