Mathématiques

Question

a. 4(2a+5)-5(3a-2) b.5(2x-4)-2(3-2x)
c. 4(3t+2)-2(-4t-6) d. -5x(2x+6)+3x(x-3)

JE ne comprend rien .. Merci!

1 Réponse

  • a) 4(2a +5) -5(3a -2)
    = 8a +20 -15a +10
    = -7a +30

    b) 5(2x -4) -2(3-2x)
    = 10x -20 -6 +4x
    = 14x -26

    c) 4(3t+2) -2 (-4t-6)
    = 12t +8 +8t +12
    = 20t +20

    d) -5x(2x +6) +3x(x-3)
    = -10x² -30x +3x² -9x
    = -7x² -39x

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