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: Phân tích đa thức thành nhân tử x+4x^2-5

Toán Lớp 8: Phân tích đa thức thành nhân tử
x+4x^2-5

Comments ( 2 )

  1. $\text{x²+4x²-5}$
    $\text{=x²+4x+4-9}$
    $\text{=(x+2)²-3²}$
    $\text{=(x+2-3)(x+2+3)}$
    $\text{=(x-1)(x+5)}$
     

  2. $ x + 4x^2 – 5 $
    $ = ( 2x )^2 + 2 . 2x . \dfrac{1}{4} + \dfrac{1}{16} – \dfrac{81}{16} $
    $ = ( 2x + \dfrac{1}{4} ) – ( \dfrac{9}{4} )^2 $
    $ = ( 2x + \dfrac{1}{4} + \dfrac{9}{4} ) ( 2x + \dfrac{1}{4} – \dfrac{9}{4} ) $
    $ = ( 2x + \dfrac{5}{2} ) ( 2x – 2 ) $
    $ = 4 ( x + \dfrac{5}{4} ) ( x – 1 ) $
     

Leave a reply

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

About Hòa Tâm