a) 5x-((4x)*-2x4x X 2+ 2*
5x - ( 16 x* - 16x +4 )
5x -16x* +16x -4
et tu calcules
a) 5x-(4x-2)^2
=5x - (4x-2) X (4x-2)
=5x - (16x^2-8x-8x+4)
= 5x-(16x^2-16x+4)
= 5x-16x^2+16x-4
= -16x^2+21x-4
b) (2x+4) (9-5x) -(1-3x)^2
= (18x-10x^2+36-20x) - (1-3x) X (1-3x)
= (-10x^2-2x+36) - (1-3x-3x+9x^2)
= -10x^2-2x+36 - (9x^2-6x+1)
= -10x^2 -2x +36 -9x^2 +6x -1
-19x^2+4x+35
^2 = au carré
Voila en espèrant tavoir aidée !
:)
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a) 5x-((4x)*-2x4x X 2+ 2*
5x - ( 16 x* - 16x +4 )
5x -16x* +16x -4
et tu calcules
a) 5x-(4x-2)^2
=5x - (4x-2) X (4x-2)
=5x - (16x^2-8x-8x+4)
= 5x-(16x^2-16x+4)
= 5x-16x^2+16x-4
= -16x^2+21x-4
b) (2x+4) (9-5x) -(1-3x)^2
= (18x-10x^2+36-20x) - (1-3x) X (1-3x)
= (-10x^2-2x+36) - (1-3x-3x+9x^2)
= -10x^2-2x+36 - (9x^2-6x+1)
= -10x^2 -2x +36 -9x^2 +6x -1
-19x^2+4x+35
^2 = au carré
Voila en espèrant tavoir aidée !
:)