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Sagot :

1)….
A) 6x-9x^2 + 2-3x + 4x^2-4x+1
-x-5x^2+3
-5x^2-x+3



B) 4x^2+20x-2x-10-(-6x^2+18x+6x-18)

4x^2+20x-2x-10-(-6x^2+24x-18)

4x^2+20x-2x-10+6x^2-24x+18

10x^2-6x+8

2)…
A) en remplacer le x=-7 dans l’équation -5x^2-x+3
Ce donner: -235

B) on fait la même chose x=-3

10x^2-6x+8

Ce donner 116



E= (3x + 1)(2 - 3x) + (2x - 1)^2
E = 3x*2 - 3x^2 + 2 - 3x + 2x^2 - 2*2x*(-1) + (-1)^2
E= 6x - 3x^2 + 2 - 3x + 2x^2 + 4x + 1
E= -3x^2 + 2x^2 + 6x - 3x + 4x + 2 + 1
E = -x^2 + 7x + 3

Si x = 7

E = -(-7)^2 + 7*(-7) + 3
E= 49 - 49 + 3
E= 0 + 3
E= 3

F = (4x - 2)(x + 5) - (3x - 3)(-2x + 6)
F = (4x^2 + 20x - 2x - 10) - (-6x^2 + 18x +6x -18)
F= 4x^2 + 20x -2x -10 - 6x^2 - 18x - 6x + 18
F = 4x^2 - 6x^2 + 20x - 18x - 2x - 6x -10 + 18
F = -2x^2 -6x + 8

Si x = -3

F= -2* (-3)^2 -6*(-3) + 8
F= -2*9 + 18 + 8
F= -18 + 18 + 8
F= 8

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