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 8: (x+2).(x-2)-(x-2)^2 chỉ em gấp ạ

Toán Lớp 8: (x+2).(x-2)-(x-2)^2 chỉ em gấp ạ

Comments ( 2 )

  1. (x+2).(x-2)-(x-2)^2
    = (x+2).(x-2)-(x-2)(x-2)
    = (x-2)(x+2-x+2)
    = (x-2).4
    = 4x-8

  2. (x+2)(x-2)-(x-2)^2
    =(x^2-2^2)-(x^2-2.x.2+2^2)
    =x^2-4-(x^2-4x+4)
    =x^2-4-x^2+4x-4
    =(x^2-x^2)+4x-(4+4)
    =4x-8
     

Leave a reply

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