Répondre :
=2xX4 + 2xX(-5x) - x + 7
=8x - 10x.2 - x + 7
=10x.2 - 8x + 7
X = le signe multiplication
.2 = racine carré
=8x - 10x.2 - x + 7
=10x.2 - 8x + 7
X = le signe multiplication
.2 = racine carré
Bonjour;
Combien fais 2x(4-5x)-(x-7)
= 8x -10x²-x+7
= -10x²+7x +7