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GokuBoss7
@GokuBoss7
May 2019
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Bonjour je suis très en retard et je n'y arrive pas aidez moi svp!
Développer et réduire les expressions :
A= ( x + 3 )( 2x - 1 ) - 3x( 2x + 5 )
B= (3x+4)^{2} - ( 1 - 2x )( 6 + x )
Factoriser les expressions :
A= ( 2x + 1 )( 8+ x ) - ( 3x - 1 )( 2x + 1 )
B= 10x^{2}-5x+15
C= (2-x)^{2} -(2-x)(9+x)
Soit B = (3x+4)^{2} - 81
a) Développer et réduire B.
b) factoriser B.
c) Calculer B pour x = -5, puis pour x = \frac{5}{3}
Merci d'avance
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elmessaoudiamina
A
2)
3)
0 votes
Thanks 1
Amal00
A=(x+3)(2x-1)-3x(2x+ 5)
=2x^2-x+6x-3-6x^2-15x
=-4x^2-10x-3
B=(3x+4)^2-(1-2x)(6+x)
=(3x)^2+24x+4^2-(6+x-12x-2x^2)
=9x^2+24x+16-6-x+12x+2x^24
=11x^2+35x+166210
A=(2x+1)(8+x)-(3x-1)(2x+1)
=(2x+1)(8+x-3x+1)
=(2x+1)(9-2x)
B=10x^2-5x+15
=5(2x^2-x+3)
C=(2-x)-(2-x)(9+x)
=(2-x)(2-x-9-x)
=(2-x)(-7-2x)
0 votes
Thanks 0
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2)
3)
=2x^2-x+6x-3-6x^2-15x
=-4x^2-10x-3
B=(3x+4)^2-(1-2x)(6+x)
=(3x)^2+24x+4^2-(6+x-12x-2x^2)
=9x^2+24x+16-6-x+12x+2x^24
=11x^2+35x+166210
A=(2x+1)(8+x)-(3x-1)(2x+1)
=(2x+1)(8+x-3x+1)
=(2x+1)(9-2x)
B=10x^2-5x+15
=5(2x^2-x+3)
C=(2-x)-(2-x)(9+x)
=(2-x)(2-x-9-x)
=(2-x)(-7-2x)