Mathématiques

Question

Svppp aiderr moii jcomprenn rien dm math
Svppp aiderr moii jcomprenn rien dm math

1 Réponse

  • A = 2x - 3 + 4x² + 7 - 5x + x²A
    = 4x² + x² + 2x - 5x -3+7
    = (4+1) x² + (2-5) x +(-3+7)
    = 5x² -3x +4 
    B = 4x - (2x + 3) + 5 - (3 - x)
    =4x-2x-3+5-3+x
    =3x-1
    C = (3x + 5)(4 + x)
    =12x²+3x²+20x+5x
     = 15x²+25x
    D = (2 -4x)(7x - 3)
    =14x-6-28x²-12
    =14x-28x²-18
    2)
    A=16x+4=4(4x+1)
     D=-6x-18=(-6)(x+3) 
    B=-9-72x=(-9)(1+8x) 
    E=9x+6=3(3x+2) 
    C=12-8x=4(3x+2) 
    F=42-14x=14(3-x)
    3) 
    (4+x)²
    =4²+2 X4 X x +x²
    16+8x+x² 

    5)
    1)
    A=3(4-2x)
     = 12-6x 
    2)x=3
    donc 
    3(4-2x3)
    =3(4-6)
    =12-18
    3) pour x=-5
    donc 3(4-2x-5)
            =12+10