bentuk sederhana dari (a + b - c)² adalah
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(a + b - c)²
= (a + b)² - 2(a + b) × c + c²
= a² + 2ab + b² - 2(a + b) × c + c²
= a² + 2ab + b² - 2c(a + b) + c²
= a² + 2ab + b² - 2ca - 2cb + c²
(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 + 2ab - 2ac + b² - 2bc + c²
[answer.2.content]
