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

Toán Lớp 8: Phân tích đa thức thành nhân tử : (3x-2)²-(2x-3)² Helpppp me

Toán Lớp 8: Phân tích đa thức thành nhân tử : (3x-2)²-(2x-3)²
Helpppp me

Comments ( 2 )

  1. \text{(3x – 2)² – (2x – 3)² }
    \text{= [(3x – 2) – (2x – 3)] [(3x – 2) + (2x – 3)]}
    \text{= (3x – 2 – 2x + 3) (3x – 2 + 2x – 3)}
    \text{= (x + 1) (5x – 5)}
    \text{= (x + 1) . 5 . (x – 1)}

  2. (3x – 2)^2 – (2x – 3)^2
    = [(3x – 2) – (2x – 3)] [(3x – 2) + (2x – 3)]
    = (3x – 2 – 2x + 3)(3x – 2 + 2x – 3)
    = (x – 1)(5x – 5)
    = (x – 1). 5(x – 1)

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

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