Développer, ordonner et réduire les expressions : A=(2 x+3)(5 x−1)
B=(4 x+1)(4 x−1)+(3 x+1)(3 x−1)
C=2 x(3 x−1)−(2 x+1)(2 x−3)
D=(2 x−1)2+(x+1)2
Bonsoir, j'y arrive pas aider-moi svp !!! :)
A=(2x+3)(5x-1)
=10x²-2x+15x-3
=10x²+13x-3
B=(4x+1)(4x-1)+(3x+1)(3x-1) On applique les identités remarquables
=16x²-1 + 9x² - 1 = 25x²-2
C=2x(3x-1)-(2x+1)(2x-3)
=6x²-2x-(4x²-6x+2x-3)
=6x²-2x-4x²+6x-2x+3
=2x²+2x+3
D=(2x-1)2+(x+1)2
=2(2x-1+x+1)
=2*3x
=6x
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A=(2x+3)(5x-1)
=10x²-2x+15x-3
=10x²+13x-3
B=(4x+1)(4x-1)+(3x+1)(3x-1) On applique les identités remarquables
=16x²-1 + 9x² - 1 = 25x²-2
C=2x(3x-1)-(2x+1)(2x-3)
=6x²-2x-(4x²-6x+2x-3)
=6x²-2x-4x²+6x-2x+3
=2x²+2x+3
D=(2x-1)2+(x+1)2
=2(2x-1+x+1)
=2*3x
=6x