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(x + 3) +x^2– 9 giải giúp mình

Toán Lớp 8: x(x + 3) +x^2– 9
giải giúp mình

Comments ( 2 )

  1. $x(x+3)+x^2-9\\=x(x+3)+(x^2-9)\\=x(x+3)+(x^2-3^2)\\=x(x+3)+(x-3)(x+3)\\=(x+3)(x+x-3)\\=(x+3)(2x-3)$

  2. Giải đáp:
    x(x + 3) +x^2– 9=x^2+3X+x^2-9=2x^2+3x-9=0
    (x-3/2)*(x+3)=0
    X-3/2=0 =>x=3/2
    x+3=0 => x=-3
             vậy x=3/2,x=-3

Leave a reply

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