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 sau thành nhân tử 3x^2 + 5y – 3xy – 5x x^2 +10x +25 – 4y^2

Toán Lớp 8: Phân tích đa thức sau thành nhân tử
3x^2 + 5y – 3xy – 5x
x^2 +10x +25 – 4y^2

Comments ( 2 )

  1. +, 3x^2 + 5y – 3xy – 5x
    = (3x^2 – 3xy ) + (5y -5x)
    = 3x(x-y) + 5(y-x)
    = 3x(x-y) – 5(x-y)
    =(x-y)(3x-5)
    +, x^2 + 10x +25- 4y^2
    =(x^2 + 2.x.5 +5^2 ) – (2y)^2
    = (x+5)^2 – (2y)^2
    =(x+5+2y)(x+5-2y)

  2. 3x^2 + 5y – 3xy – 5x
    = (3x^2 – 3xy) + (5y – 5x)
    = 3x(x – y) + 5(y – x)
    = 3x(x – y) – 5(x – y)
    = (3x – 5)(x – y)
    x^2 + 10x + 25 -4y^2
    = x^2 + 2 . 5 . x + 5^2 – 4y^2
    = (x + 5)^2 – (2y)^2
    = (x + 5 – 2y)(x + 5 + 2y)

Leave a reply

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