Question

Phân tích thành nhân tử

x²+8xy+16y²-4z²

Answer 1

`x^2 + 8xy + 16y^2 - 4z^2`

`= (x^2 + 8xy + 16y^2) - 4z^2`

`= [x^2 + 2 . x . 4y + (4y)^2] - (2z)^2`

`= (x + 4y)^2 - (2z)^2`

`= (x + 4y - 2z)(x + 4y + 2z)`

Answer 2

\(=\left(x^2+8xy+16y^2\right)-4z^2=\left(x+4y\right)^2-\left(2z\right)^2\)

\(=\left(x+4y+2z\right)\left(x+4y-2z\right)\)