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3x²-2x+5 -x² -4x + 3
(3-1)x²+(-2-4)x +5 +3
2x² -6x +8
b) 8x²-5xy + 12 - (-5x²+9xy-24)
8x² - 5xy + 12 + 5x² - 9xy + 24
(8+5)x² + (-5-9)xy + 36
13x² - 14 xy + 36
c) -7x+8y - (-6x+9y)
-7x+8y + 6x - 9y
(-7+6)x + (8-9)y
-x + y
^_^
= 3x² - x² - 2x - 4x + 5 + 3
= 2x² - 6x + 8
b. (8x² - 5xy + 12) - (-5x² + 9xy - 24)
= 8x² + 5x² - 5xy - 9xy + 12 + 24
= 13x² - 14xy + 36
c. (-7x + 8y) - (-6x + 9y)
= -7x + 6x + 8y - 9y
= -x -y