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−4) (x+5) ^2 ( Rút gọn biểu thức )

Toán Lớp 8: (x−4) (x+5) ^2 ( Rút gọn biểu thức )

Comments ( 2 )

  1. (x-4)(x+5)^2
    =(x-4)(x^2+2×5+5^2)
    =(x-4)(x^2+10x+25)
    =x.x^2+x.10x+x.25-4.x^2-4.10x-4.25
    =x^3+10x^2+25x-4x^2-40x-100
    =x^3+(10x^2-4x^2)-(40x-25x)-100
    =x^3+6x^2-15x-100
     

  2. (x-4)(x+5)^2
    =(x-4)(x^2+10x+25)
    =x^3+10x^2+25x-4x^2-40x-100
    =x^3+6x^2-15x-100
     

Leave a reply

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