Sagot :
Réponse :
bonsoir
développer et réduire
A=5(2s+3)=10s+15
B=3(a-b+3c)=3a-3b+9c
C=-4z(z+6)=-4z²-24
D=2(u+6)-3(u-4)=2u+12-3u+12=-u+24
E=(2g+3)(g+7)=2g²+14g+3g+21=2g²+17g+21
F=(6-h)(3h-1)=18h-6-3h²+h=-3h²+19h-6
G=(8+x)²=64+16x+x²=x²+16x+64
H=(2+5u)(2-5u)=4-10u+10u-25u²=-25u²+4
I=(7h-2)²=49h²-28h+4
factoriser
A=4x-16y+8=4(x-4y+2)
B=21x²+7x=7x(3x+1)
C= (x-7)(2x+1)+(x-7)(5x+6)=(x-7)(2x+1+5x+6)=(x-7)(7x+7)
D=(3x+1)(5x-1)-(3x+1)(2x+3)=(3x+1)(5x-1-2x-3)=(3x+1)(3x-4)
E=4x²+28x+49=(2x+7)²
F=25x²-20x+4=(5x-2)²
G=16x²-81=(4x-9)(4x+9)
Explications étape par étape
Réponse :
on met * pour multiplier
A =5(2s+3) = 10s+15
B=3(a-b+3c) = 3*a +3*-b + 3*3c = 3a-3b+9c
C = -4(z+6) = -4z-24
D = 2u+12-3u+12 = -u+24
E = 2g²+14g+3g+21=2g²+17g+21
F = 18h-6-6h²+h= -6h²+19h-6
G = 64+16x+x²
(8+x)²= (a=b)²= a²+2ab+b²
H = 4-25u²
(2+5u)(2-5u) =(a+b)(a-b)=a²-b²
I = 49h²-28h+4
(7h-2)²= (a-b)²= a²-2ab+b²
factoriser :
A=4x-16y+8 = 4(x-4y+2)
B = 7x(3x+1)
C=(x-7)(2x+1)+(x-7)(5x+6)
(x-7)(2x+1+5x+6)=
(x-7)(7x+7)=
7(x-7)(x+1)
D=(3x+1)(5x-1)-(3x+1)(2x+3)
(3x+1)(5x-1-2x-3)=
(3x+1)(3x-4)
E = 4x²+28x+49=a²+2ab+b²=(a+b)²= (2x+7)²
F = 25x²-20x+4=a²-2ab+b²=(5x-2)²
G = 16x²-81=a²-b²=(a-b)(a+b)=(4x-9)(4x+9)
Explications étape par étape