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a. (6x + 5) + ( -3x - 6) = 6x - 3x + 5 - 6 = 3x - 1
b. (6x - 5y - 2z) + (-8x + 6y + 9z) = 6x - 8x - 5y + 6y - 2z + 9z = - 2x + y + 7z
c. 3(2x² - 4x + 5) + 2(4x² + 3x - 7) = (6x² - 12x + 15) + (8x² + 6x - 14) = 6x² + 8x² - 12 x + 6x + 15 - 14 = 14x² - 6x + 1
Pengurangan
a. (7x + 15y) - (5x - 9y) = 7x - 5x + 15y + 9y = 2x + 24y
b. (5y - 3x - 4) - (5x - 3y - 4) = - 3x - 5x + 5y + 3y - 4 + 4 = - 8x + 8y
c. (5x² - 9xy - 4y²) - (-x² + 6xy + 3y²) = 5x² + x² - 9xy - 6xy - 4y² - 3y² = 6x² - 15xy - 7y² = 6x² - 7y² - 15xy