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= 10x + 15y - 3y + 12y + 2x + 4y + 8
= 10x - 3y + 2x + 15y + 12y + 4y + 8
= 9x + 31y + 8
2.) (5x-3y) (5x+3y)
= 25x² + 15xy -15xy - 9y²
= 25x² - 9y²
-> 9x + 31y + 8
2. 25x²+15xy-15xy-9y² = 25x²-9y²