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Sagot :
Answer:
3a^2 + 3b^2
Step-by-step explanation:
So look for common terms and add them together or subtract.

(2a + b)^2 + (a + 2b)
(2a + b)(2a + b) + (a + 2b)
(2a + b)[(2a + b) + (a + 2b)]
(2a + b)(3a + 3b)
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