Aider moi SVP
1) Developper et reduire
a) (5x+7)(1-3x)
b) 4x(-x+3) - (2x+5) (x-1)
c) (y+1/5) (y-1/5)
(vous pouvez mettres tout les etapes svp)
1) Developper et reduire
a) (5x+7)(1-3x)
b) 4x(-x+3) - (2x+5) (x-1)
c) (y+1/5) (y-1/5)
(vous pouvez mettres tout les etapes svp)
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=5x-15x²+7-21x
=-15x²-16x+7
b) 4x(-x+3) - (2x+5) (x-1)
=-4x²+12x-(2x²-2x+5x-5)
=-4x²+12x-2x²+2x-5x+5
=-6x²+9x+5
c) (y+1/5) (y-1/5)
=y²-(1/5)²
=y²-1/25 car (a+b)(a-b)=a²-b²
d)(4x-7)²= 16x²-56x+49