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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Phân tích đa thức thành nhân tử x^3 – x^2 – 14x + 24

Toán Lớp 8: Phân tích đa thức thành nhân tử
x^3 – x^2 – 14x + 24

Comments ( 2 )

  1. $x^{3}$ -$x^{2}$ -14x +24
    =$x^{3}$ -2 $x^{2}$ +$x^{2}$ -12x +24
    =$x^{2}$ .(x-2) +x.(x-2)-12.(x-2)
    =(x-2).($x^{2}$ +x -12)
    =(x-2).($x^{2}$ +4x-3x-12)
    =(x-2).(x.(x-4)-3.(x-4))
    =(x-2).(x+4).(x-3)

  2. Giải đáp:
     x^3−x^2−14x+24
    =x^3−3x^2+2x^2−6x−8x+24
    =x^2.(x−3)+2x.(x−3)−8.(x−3)
    =(x−3).(x^2+2x−8)
    =(x−3).(x^2+4x−2x−8)
    = (x – 3).[x.(x + 4) – 2.(x + 4)]
    =(x−3).(x−2).(x+4)
    ∘ dariana 

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222-9+11+12:2*14+14 = ? ( )

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