Mathematics · Algebra
Simplify the following expression: (3z - 9y)2 + (9z + 3y)2 - 81z2
- 13z2 + 81y2
- 218z2 + 91y2
- 37z2 + 95y2
- 49z2 + 90y2✓
Correct answer
9z2 + 90y2
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