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= 9a + 12 - (7a + 14)
= 9a + 12 - 7a - 14
= 9a - 7a + 12 - 14
= 2a - 2
b. 2y + 15x - 18 dari 11y - 17x + 2x
= 11y - 17x + 2x - (2y + 15x - 18)
= 11y - 17x + 2x - 2y - 15x + 18
= 11y - 2y - 17x + 2x - 15x + 18
= 9y - 30x + 18
= -30x + 9y + 18
<gak ada sejarahnya y didahulukan daripada x> :p
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a. 12 + 2 (4x - 3)
= 12 + (2 × 4x) - (2 × - 3)
= 12 + 8x (- 2 × -3)
= 12 + 8x + 6
b. a (a+3b) + 2a (4a +5b)
= (a × a + a × 3b) + (2a × 4a + 2a × 5b)
= a² + 3ab + 8a² + 10ab
= a² + 8a² + 3ab + 10ab
= 9a² + 13ab
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a.18x - 5 (x - 3y)
= 18x (- 5 × x) (- 5 × - 3y)
= 18x - 5x + 15y
= 13x + 15y
b. 12 + 2 (4x - 3)
= 12 + (2 × 4x) - (2 × -3)
= 12 + 8x (- 2 × -3)
= 12 + 8x + 6
= 8x + 12 + 6
= 8x + 18
c. a (a + 3b) + 2a (4a + 5b)
= (a × a + a × 3b) + (2a × 4a + 2a × 5b)
= a² + 3ab + 8a² + 10ab
= a² + 8a² + 3ab + 10ab
= 9a² + 13ab