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= (x - y - z)²
dasar : a² - 2.a.b + b² = (a - b)²
2 . x² + 6x (a + b) + 9 (a + b)² = {x + 3(a + b)}²
= (x + 3a + 3b)²
3 . x² - 6x (a + b) + 9 (a + b)² = {x - 3(a + b)}²
= (x - 3a - 3b)²
4 . (x - 3y)² - (y - x)² = (x - 3y + y - x) (x - 3y - (y - x))
= - 2y (x - 3y - y + x)
= - 2y (2x - 4y)
= - 2y . 2 (x - 2y)
= - 4y (x - 2y)
5 . (3x - y)² - (5x - 3y)² = (3x - y + 5x - 3y) {3x - y - (5x - 3y)}
= (8x - 4y) (3x - y - 5x + 3y)
= (8x - 4y) (- 2x + 2y)