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Exercice 3
Développer chacune des expressions littérales suivantes :
D= (2x - 5) x (2x + 5)
E = -(x + 2) x (2x - 1)
A= (6x - 4)^2
B=(2x + 5)^2
C = (3x + 5) X (5x - 3)
F = (x - 1/3)^2

Sagot :

A1111

A= (6x - 4)^2

A= (6x - 4)(6x - 4)

A= 32x²-48x+16

B=(2x + 5)^2

B=(2x + 5)(2x + 5)

B=4x²+20x+25

C = (3x + 5) X (5x - 3)

C = 15x+16x-15

D= (2x - 5) x (2x + 5)

D= 4x² - 25

E = -(x + 2) x (2x - 1)

E = -(2x²-x+4x-2)

E = -2x²-3x+2

F = (x - 1/3)^2

F= x²-(2/3)x+1/3