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: Tìm x: A) x (x+1)-x^2+1=0 B) (x+3)^2-(x+2)(x-2)=4x+17

Toán Lớp 8: Tìm x:
A) x (x+1)-x^2+1=0
B) (x+3)^2-(x+2)(x-2)=4x+17

Comments ( 2 )

  1. A) x (x+1)-x^2+1=0
    ⇔ x² + x – x² + 1 = 0
    ⇔ x + 1 = 0
    ⇔ x= -1
    B) (x+3)^2-(x+2)(x-2)=4x+17
    ⇔x² + 6x + 9 – x² + 4 = 4x +17
    ⇔ 6x + 13 = 4x + 17
    ⇔ 2x = 4
    ⇔ x = 2
    Bạn vote mình 5 sao nha cảm ơn bạn nhìu 
    chúc bạn học tốt

  2. a,x (x+1)-x^2+1=0
    ⇔x²+x-x²+1=0
    ⇔x+1=0
    ⇔x=-1
    b, (x+3)^2-(x+2)(x-2)=4x+17
    ⇔x²+6x+9-x²+4 -4x-17=0
    ⇔2x-4=0
    ⇔2x=4
    ⇔x=4÷2
    ⇔x=2

Leave a reply

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

About Linh