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NOURMARCHOUH
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Exercice 1
1. Développer puis réduire si possible les expressions suivantes :
A = 3 (5x + 7)
7) =......
B = 5 * (2x - 6)
C = (3x - 4)(5x - 7)
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N = (4 - x)2 =...
2. Factoriser les expressions suivantes :
D = 3x + 3y = .
........ :; E = -35a + 45b = .....
F = 6x2 + 24xy = .....
.;; G = 5z3 - 5z = ...
aider moi svp​

Sagot :

HMIMSALEILA768

1)

A = 3(5x + 7)

=15x+21

B = 5(2x - 6)

=10x-30

C = (3x - 4)(5x - 7)

=15x2-21x-20x+28

=15x2-41x+28

N = (4 - x)2

=(4)2-2×4×x+x2

=16-8x+x2

2)

D = 3x + 3y

=3(x+y)

E = -35a + 45b

=5(-7a+9b)

F = 6x2 + 24xy

= 6x(x+4y)

G = 5z3 - 5z

=5z(z2-1)

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