Bonjour,
Ex. 3 :
5x - 2 + 6x + 8
= 5x + 6x - 2 + 8
= 11x + 6
2x² + 4x + 9 - 5x² - 7 + 8x
= 2x² - 5x² + 4x + 8x + 9 - 7
= -3x² + 12x + 2
x - 4 - 5x + 3x² + 11 + 7x + 3x²
= 3x² + 3x² + x - 5x + 7x - 4 + 11
= 6x² + 3x + 7
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Bonjour,
Ex. 3 :
5x - 2 + 6x + 8
= 5x + 6x - 2 + 8
= 11x + 6
2x² + 4x + 9 - 5x² - 7 + 8x
= 2x² - 5x² + 4x + 8x + 9 - 7
= -3x² + 12x + 2
x - 4 - 5x + 3x² + 11 + 7x + 3x²
= 3x² + 3x² + x - 5x + 7x - 4 + 11
= 6x² + 3x + 7