Mathematics · Algebra
The expression (x + y + 2z)(x + y) can be written in which of the following forms?
- 1(x - y + z)2 - z2
- 2(x + y + z)2 - z2✓
- 3(x + y + z)2 - y2
- 4(x + y + z)2 - x2
Correct answer
(x + y + z)2 - z2
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