tolong bantu yang a no 8

Mapel : Matematika
Bab : Aljabar

(a + 2b)²
= (a + 2b) (a + 2b)
= a (a + 2b) + 2b (a + 2b)
= a² + 2ab + 2ab + 4b²
= a² + 4ab + 4b²

jawab

(a+2b)²=...

= (a+2b)(a+2b)
= a²+2ab+2ab+4b²
= a²+4ab+4b²

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