Sagot :
105x (3x - 7) - 357 (-7 + 3x )
=105x (3x - 7) - 357 (3x-7 )
(3x-7)(105x-357)
E= 105x * 3x - 105x * 7 - 357 * -7 + 357 * 3x
E= 315x² - 735x + 2499 + 1071x
E=315x² + 336x +2499
105x (3x - 7) - 357 (-7 + 3x )
=105x (3x - 7) - 357 (3x-7 )
(3x-7)(105x-357)
E= 105x * 3x - 105x * 7 - 357 * -7 + 357 * 3x
E= 315x² - 735x + 2499 + 1071x
E=315x² + 336x +2499