BonjourA = x² -9A = x² -3²A = (x - 3)(x + 3)B = -9x² + 4xB = -3² x x² + 2² x xB = x ( -9x + 4)C = 4 - 25x²C = 25x² + 4C = (-5x + 2)(5x + 2)D = 12x² - 27D = 2² x 3x² - 3cubeD = 3( 2² x 3x²/3 - 3cube/3 )D = 3 (2x -3)(2x +3)
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Bonjour
A = x² -9
A = x² -3²
A = (x - 3)(x + 3)
B = -9x² + 4x
B = -3² x x² + 2² x x
B = x ( -9x + 4)
C = 4 - 25x²
C = 25x² + 4
C = (-5x + 2)(5x + 2)
D = 12x² - 27
D = 2² x 3x² - 3cube
D = 3( 2² x 3x²/3 - 3cube/3 )
D = 3 (2x -3)(2x +3)