Penjelasan dengan langkah-langkah:
a) 7x - 12 + 5x +15
= 7x + 5x -12 + 15
= 12x- 3
b) 12 x³-5x² + 7x - 10 x³ - 2x² + x + 4
= 12x³ - 10x³ - 5x² - 2x² + 7x + x - 10 + 4
= 2x³ - 7x² + 8x - 6
c) 3x² - 4xy + y² + 3x² - 5xy + 2y²
= 3x² +3x² - 4xy - 5xy + y² + 2y²
= 6x² -9xy + 3y²
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Penjelasan dengan langkah-langkah:
a) 7x - 12 + 5x +15
= 7x + 5x -12 + 15
= 12x- 3
b) 12 x³-5x² + 7x - 10 x³ - 2x² + x + 4
= 12x³ - 10x³ - 5x² - 2x² + 7x + x - 10 + 4
= 2x³ - 7x² + 8x - 6
c) 3x² - 4xy + y² + 3x² - 5xy + 2y²
= 3x² +3x² - 4xy - 5xy + y² + 2y²
= 6x² -9xy + 3y²