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

Toán Lớp 8: Phân tích đa thức thành nhân tử (3x+1)>2 + 4(3x+1) + 4 Tìm x : (x+2) 2 – (x+2)(x-2) = 0

Toán Lớp 8: Phân tích đa thức thành nhân tử
(3x+1)>2 + 4(3x+1) + 4
Tìm x : (x+2) 2 – (x+2)(x-2) = 0

Comments ( 2 )

  1. a) (3x-1)^2 + 4(3x-1) + 4
          =(3x-1).(2 + 4 + 4 )
          = (3x – 1) . 10
     b) ( x + 2 )^2 – ( x + 2 )( x – 2 ) = 0
         (x+2)(x+2) – (x+2)(x-2) = 0
         (x+2)(x+2-x+2) = 0
         (x+2).4              = 0
          x + 2                = 0
    => x                       = -2
    Vậy x = -2

  2. (3x+1).2+4(3x+1)+4$\\$
    =(3x+1)(2+4+4)$\\$
    =10.(3x+1)$\\$
    ———————————–
    (x+2)^2-(x+2)(x-2)=0$\\$
    ->x^2+2.x.2+2^2-(x^2-2^2)=0$\\$
    ->x^2+4x+4-x^2+4=0$\\$
    ->(x^2-x^2)+4x+(4+4)=0$\\$
    ->4x+8=0$\\$
    ->4x=0-8$\\$
    ->4x=-8$\\$
    ->x=(-8):4$\\$
    ->x=-2$\\$
    Vậy x=-2
     

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

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