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

Toán Lớp 8: $2x^2 + 4x – 70$ Phân tích đa thức thành nhân tử

Toán Lớp 8: $2x^2 + 4x – 70$
Phân tích đa thức thành nhân tử

Comments ( 2 )

  1. y10000
    •2x² + 4x – 70
    = 2 . ( x² + 2x + 35 )
    = 2. ( x² + 7x – 5x – 35 )
    = 2 . [x.(x+7)-5.(x+7)]
    = 2.( x – 5 ) . ( x + 7 )
     

  2. 2x^2 + 4x -70
    = 2( x^2 + 2x – 35)
    = 2 (x^2 + 7x – 5x – 35)
    = 2[x(x-7) -5 (x-7)]
    = 2(x-7)(x-5)

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

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