a. ( x+1 )(2+ x ) b. (2+ x )(5+ x ) c. (2 x +7)(3 x +4) d. (6+9 x )(7 x +8)
Mathématiques
emelinebauche
Question
a. (x+1)(2+x)
b. (2+x)(5+x)
c. (2x+7)(3x+4)
d. (6+9x)(7x+8)
b. (2+x)(5+x)
c. (2x+7)(3x+4)
d. (6+9x)(7x+8)
2 Réponse
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1. Réponse amykim12
A = (x+1)(2+x)
= 2x + x² + 2 + x
A = x² + 3x + 2
B = (2+x)(5+x)
= 10 + 2x + 5x + x²
B = x² + 7x + 10
C = (2x+7)(3x+4)
= 6x² + 8x + 21x + 28
C = 6x² + 29x + 28
D = (6+9x)(7x+8)
= 42x + 48 + 63x² + 72x
D = 63x² + 114x + 48 -
2. Réponse babysana23
a.
(x+1)(2+x)
=x*2+x*x+1*2+1*x
=2x+1x²+2+1x
=1x²+3x+2
b.
(2+x)(5+x)
=2*5+2*x+x*5+x*x
=10+2x+5x+1x²
=1x²+7x+10
c.
(2x+7)(3x+4)
=2x*3x+2x*4+7*3x+7*4
=6x²+8x+21x+28
=6x²+29x+28
d.
(6+9x)(7x+8)
=6*7x+6*8+9x*7x+9x*8
=42x+48+63x²+72x
=63x²+114x+48
p-s: * c'est le fois
voilà :)