faktorkanlah x2 - 2xy + y2

Bentuk aljabar (a + b)²
⇒ a² + 2ab + b²

x² - 2xy + y²
⇒(x - y)²

x^2 - 2xy + y^2
= x^2 - xy - xy + y^2
= x(x - y) - y(x - y)
= (x - y)(x - y)
= (x - y)^2