Developper les expressions suivantes : 1. B = -3( -6 -4x) 2. C = -4( 7 - 5x) 3. D = (-5x + 4) * 2 4. E = ( 2 - 3x) *3x Merci d’avance

Bonjour,

-3(-6-4x) = (-3)×(-6) - 3×(-4x) = 18+12x
-4(7- 5x) = (-4)×7 - 4×(-5x) = -28+20x
(-5x+4)×2 = -5x×2 + 4×2 = -10x+8
(2-3x)×3x = 2×3x + (-3x)×3x = 6x-9x²

Bonjour ,
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1. B=-3(-6-4x)=(-3)×(-6)+(-3)×(-4x)=18+12x.

2. C=-4(7-5x)=(-4)×7+(-4)×(-5x)= -28+20x.

3. D=(-5x+4)×2=2×(-5x)+2×4=-10x+8.

4. (2-3x)×3x=(3x)×(2)-(3x)×(3x)=6x-9x².
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:)