Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

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

Toán Lớp 6: -12-(x-4)^2=-76

Toán Lớp 6: -12-(x-4)^2=-76 mong mọi người giải nhanh giúp em

Comments ( 2 )

  1. – 12 – ( x – 4 )^2 = – 76
    ⇒ ( x – 4 )^2 = – 12 – ( – 76 )
    ⇒ ( x – 4 )^2 = 64
    ⇒ $\left[\begin{matrix}( x – 4 )^2 = 8^2\\( x – 4 )^2 = ( – 8 )^2\end{matrix}\right.$
    ⇒ $\left[\begin{matrix} x – 4 = 8\\x – 4 = – 8\end{matrix}\right.$
    ⇒ $\left[\begin{matrix} x = 12\\ x = – 4\end{matrix}\right.$
    Vậy , x ∈ { 12 ; – 4 } .

  2. -12-(x-4)^2=-76
    (x-4)^2=(-12)-(-76)
    (x-4)^2=64
    (x-4)^2=(+-8)^2
    =>\(\left[ \begin{array}{l}x-4=8\\x-4=-8\end{array} \right.\) 
    =>\(\left[ \begin{array}{l}x=12\\x=-4\end{array} \right.\) 
    Vậy x in{12;-4}
     

Leave a reply

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

About Khánh Ly