Bonjour,
Factoriser:
A=3(4x² - 49) - (2x + 7)²
A= 3(2x-7)(2x+7) - (2x+7)(2x+7)
A= (2x+7) [3(2x-7)-(2x+7) ]
A= (2x+7)(6x-21-2x-7)
A= (2x+7)(4x-28)
A= 4(2x+7)(x-7)
B=(3x + 1)² - x² - 2x + 1
B= 9x²+3x+3x+1-x²-2x+1
B= 9x²+6x+1-x²-2x+1
B= 8x²+4x+2
B= 2(4x²+2x+1)
