👤

Développer chacune des expressions littérales suivantes : A = (9 x − 8)2 B = (7 x − 5) × (7 x + 5) C = (5 x + 4)2 D = (9 x + 1) × (x − 9) E = − (10 x − 9)2 F = 8 x + 2 7 × 8 x − 2 7

Répondre :

Bonsoir;

A = (9 x − 8)²

= 81x² - 144x +64

B = (7 x − 5) × (7 x + 5)

= 49x² -25

C = (5 x + 4)²

= 25x² +40x +16

D = (9 x + 1) × (x − 9)

= 9x² -81x +x -9

= 9x² -80x -9

E = − (10 x − 9)²

= -( 100x² -90x +81)

= -100x² +90x -81

F = 8 x + 2 7 × 8 x − 2 7

= 8x + 216x -27

= 224x -27