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

Toán Lớp 8: Tìm x: x ² (x – 3) + 12 – 4x = 0

Toán Lớp 8: Tìm x: x ² (x – 3) + 12 – 4x = 0

Comments ( 2 )

  1. x^2 (x – 3) + 12 – 4x = 0
    ⇔ x^2 (x – 3) – 4x + 12 = 0
    ⇔ x^2 (x – 3) – 4 (x – 3) = 0
    ⇔ (x^2 – 4) (x – 3) = 0
    ⇔ (x – 2) (x + 2) (x – 3) = 0
    ⇔  \(\left[ \begin{array}{l}x – 2=0\\x+ 2 = 0\\x-3=0\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x =2\\x = -2\\x=3\end{array} \right.\) 
                Vậy x ∈ {-2; 2; 3}
    ——–
    $\color{white}{\text{yangyang}}$  — #Hogwarts
    Chúc bạn học tốt!!! ????????????
    Chỗ nào không hiểu thì comment nha!!

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

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