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

Toán Lớp 7: 3.(x+3) mũ 2-10=17 bai nay cx tim x luon nha giup mik voi mik dang voi

Toán Lớp 7: 3.(x+3) mũ 2-10=17
bai nay cx tim x luon nha
giup mik voi mik dang voi

Comments ( 2 )

  1. 3(x+3)^2 – 10 = 17
    <=> 3(x+3)^2 = 17 + 10
    <=> 3(x+3)^2 = 27
    <=> (x+3)^2 = 27 : 3
    <=> (x+3)^2 = 9
    <=> (x+3)^2 = (±3)^2
    <=> \(\left[ \begin{array}{l}x+3=3\\x+3=-3\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=0\\x=-6\end{array} \right.\) 
    Vậy x∈{0;-6}

  2. 3.(x+3)^2-10=17
    => 3.(x+3)^2=27
    => (x+3)^2 = 9
    => (x+3)^2 = 3^2
    Xét x + 3 = 3
    => x = 0
    Xét x + 3 = -3
    => x = -6
    Vạy x = 0;-6
    (Chúc bạn học tốt)
     

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

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