DIDINECAVIGNAC
Answered

Bonjour pouvez-vous m'aider ?
•Développer et réduire les expressions suivantes :
A = 2x - 3(x + 5)
B = (x + 5)(x - 4)
C = (x - 4)²
D = (2x - 5)(3x - 4)
E = (2x - 5)² - 2x(x - 7) ​

Sagot :

MAHAM

Bonjour

A = 2x -3(x+5)

A = 2x-3x-15

A = -x-15

B = (x+5)(x-4)

B = x²-4x+5x-20

B = x²+x-24

C = (x-4)²

C = x²-2x*4+4²

C = x²-8x+16

D = (2x-5)(3x-4)

D = 6x²-8x-15x+20

D = 6x²-23x+20

E = (2x-5)²-2x(x-7)

E = 4x²-2*2x*5+5²-2x²+14x

E = 2x²-20x+25+14x

E = 2x²-6x+25