Sagot :
(2x + 3)(2x-3)
= (2x * 2x) + (2x * (-3) ) + (3 * 2x) + (3 * (-3) )
= 4x au carré - 6x + 6x - 9x
= 4x au carré - 9x
= (2x * 2x) + (2x * (-3) ) + (3 * 2x) + (3 * (-3) )
= 4x au carré - 6x + 6x - 9x
= 4x au carré - 9x