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^3 – 4x^2 – 5x = 0 ===-.

Toán Lớp 8: x^3 – 4x^2 – 5x = 0
…………………………………..

Comments ( 1 )

  1. x^3 – 4x^2 – 5x = 0
    <=> x(x^2 – 4x – 5) = 0
    <=> x(x^2 + x – 5x – 5) = 0
    <=> x[x(x+1) – 5(x+1)] = 0
    <=> x(x-5)(x+1) = 0
    <=> $\left[\begin{matrix} x-5 = 0\\ x+1 = 0\end{matrix}\right .$ hoặc x = 0
    <=> $\left[\begin{matrix} x=5\\ x=-1\end{matrix}\right.$ hoặc x = 0
    Vậy x∈{5;-1;0}

Leave a reply

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

About Nhi