Bonsoir,
1) A = (3x-6) (3x+6)-(3x-6)(2x+7)
9x² - 36 - (6x² + 21 x - 12 x - 42)
9x² - 36 - 6x² - 9x + 42
3x² - 9x + 6
2)
A = (3x-6) (3x+6)-(3x-6)(2x+7)
A = (3x-6) [ (3x+6) - ( 2x+7)]
A = (3x-6) ( x - 1)
3) A = (3*2-6) ( 2 - 1) = 0
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Bonsoir,
1) A = (3x-6) (3x+6)-(3x-6)(2x+7)
9x² - 36 - (6x² + 21 x - 12 x - 42)
9x² - 36 - 6x² - 9x + 42
3x² - 9x + 6
2)
A = (3x-6) (3x+6)-(3x-6)(2x+7)
A = (3x-6) [ (3x+6) - ( 2x+7)]
A = (3x-6) ( x - 1)
3) A = (3*2-6) ( 2 - 1) = 0