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: Câu 3:Tìm x a) (2X+3)^2+x(1-4x)=-4

Toán Lớp 8: Câu 3:Tìm x
a) (2X+3)^2+x(1-4x)=-4

Comments ( 2 )

  1. (2x + 3)^2 + x(1 – 4x) = -4
    4x^2 + 12x + 9 + x – 4x^2 = -4
    13x + 9 = -4
    13x = -13
    x = -1
    Vậy x = -1
    Gửi bạn!

  2. $(2x + 3)^2 + x(1 – 4x) = -4$
    $(2x)^2 + 2.2x.3 + 3^2 + x.1 – x.4x = -4$
    $4x^2 + 12x + 9 + x – 4x^2 = -4$
    $4x^2 – 4x^2 + 12x + x + 9 = -4$
    $13x + 9 = -4$
    $13x = -4 – 9$
    $13x = -13$
    $x = -13 : 13$
    $x = -1$
    \text{Vậy} $x = -1$

Leave a reply

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