Answered

Ex 3 Développe et réduis les expressions suivantes :
A =-3( 5x - 1)
B = 3( 4 + 3x )
D= ( 3x + 7)(5x + 3) E = ( 6x +4)(3 - 4x)-(4x+7)(5x+3)
C=-2( 7x - 1). 5( 4 + 3x)
F=-3(2x + 4)(3 - 4x)
=
=
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Sagot :

Bonsoir,

A =-3( 5x - 1)

= -15x +3

B = 3( 4 + 3x )

=12 +9x

D= ( 3x + 7)(5x + 3)

= 15x² +9x +35x +21

= 15x² +44x +21

E = ( 6x +4)(3 - 4x)-(4x+7)(5x+3)

= 18x -24x² +12 -16x -( 20x² +12x +35x+21)

=18x -24x² +12 -16x - 20x² -12x -35x-21

= -44x² -45x -9

C=-2( 7x - 1). 5( 4 + 3x)

quel signe?

F= -3(2x + 4)(3 - 4x)

= (-6x -12)( 3-4x)

= -18x +24x² -36 +48x

= 24x²+ 31x -36