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

Toán Lớp 8: X^2-4=x+8 Giải chi tiết giúp e

Toán Lớp 8: X^2-4=x+8
Giải chi tiết giúp e

Comments ( 1 )

  1. $#Cr7$
    x^2 – 4 = x + 8
    x^2 – 4 – x – 8 = 0
    x^2 – x – 12 = 0
    x^2 + 3x – 4x – 12 = 0
    x(x + 3) – 4(x + 3) = 0
    (x + 3) (x – 4) = 0
    <=> \(\left[ \begin{array}{l}x+3=0\\x-4=0\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=-3\\x=4\end{array} \right.\) 
    <=> x = -3 hoặc x = 4

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