Répondre :
Bonjour;
=(7x-1)(5+2x)-(7x-1)²
=(7x-1) ( 5+2x-7x+1)
= (7x-1) ( -5x +6)
L = (7x - 1)(5 + 2x) - (7x - 1)²
L = (7x - 1)(5 + 2x) - (7x - 1)(7x - 1)
L = (7x - 1)[(5 + 2x) - (7x - 1)]
L = (7x - 1)(5 + 2x - 7x + 1)
L = (7x - 1)(6 - 5x)
Bonjour;
=(7x-1)(5+2x)-(7x-1)²
=(7x-1) ( 5+2x-7x+1)
= (7x-1) ( -5x +6)
L = (7x - 1)(5 + 2x) - (7x - 1)²
L = (7x - 1)(5 + 2x) - (7x - 1)(7x - 1)
L = (7x - 1)[(5 + 2x) - (7x - 1)]
L = (7x - 1)(5 + 2x - 7x + 1)
L = (7x - 1)(6 - 5x)