(a-b+c)2 Tolong dijawab yaa pliss

(a-b+c)²
= (a-b+c)(a-b+c)
= a(a-b+c)-b(a-b+c)+c(a-b+c)
= a²-ab+ac-ab+b²-bc+ac-bc+c²
= a²-ab-ab+ac+ac+b²-bc-bc+c²
= a²-2ab+2ac+b²-2bc+c²

maaf kalau salah saya hanya membantu