Réponse:
exercice 1:
B=(5x-4)²=(5x)²-2(5x)(4)+4²=25x²-40x+16
C=(2x+3)(2x-3)=(2x)²-3²=4x²-9
A=(3x+2)²=(3x)²+2(3x)2+2²=9x²+12x+4
D=2x(8x-3)=16x²-6
E=(3x+6)(2x-5)=(6x²-15x+12x-30)=6x²-3x-30
ex2:
1) G=(2x-5)²-(3x-4)(-2x-5)=(2x)²-2(2x)5+5²)-(-6x-15x+8x+20)=(4x²)-20x+25-(13x+20)=4x²-20x+25-13x-20=4x²-33x+5
on a: x=3
donc : 4(3²)-33*3+5=4*9-99+5=36-99+5=-58
et on a:
x=-5
donc : 4(-5)²-33(-5)+5= 100+165+5= 270
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Réponse:
exercice 1:
B=(5x-4)²=(5x)²-2(5x)(4)+4²=25x²-40x+16
C=(2x+3)(2x-3)=(2x)²-3²=4x²-9
A=(3x+2)²=(3x)²+2(3x)2+2²=9x²+12x+4
D=2x(8x-3)=16x²-6
E=(3x+6)(2x-5)=(6x²-15x+12x-30)=6x²-3x-30
ex2:
1) G=(2x-5)²-(3x-4)(-2x-5)=(2x)²-2(2x)5+5²)-(-6x-15x+8x+20)=(4x²)-20x+25-(13x+20)=4x²-20x+25-13x-20=4x²-33x+5
on a: x=3
donc : 4(3²)-33*3+5=4*9-99+5=36-99+5=-58
et on a:
x=-5
donc : 4(-5)²-33(-5)+5= 100+165+5= 270