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2 (x² - 2xy + 6) - 5 + 2xy = 2x² - 4xy + 12 - 5 + 2xy
= 2x² - 4xy + 2xy + 12 - 5
= 2x² - 2xy + 7 (A)
Nomor 2
12x² - 9x - 6 + 3x² + 7x + 14 = 12x² + 3x² - 9x + 7x - 6 + 14
= 15x² -2x +8 (D)
Nomor 3
8x² - 18y² = 2 (4x² - 9y²)
= 2 (2x - 3y) (2x + 3y)
*Catatan untuk nomor 3
a² - b² = (a +b) (a - b)