Question

Phân tích đa thức sau thành nhân tử:

\(x^2-7xy+12y^2\)

Answer 1

\(x^2-7xy+12y^2\)

\(=x^2-4xy-3xy+12y^2\)

\(=x\left(x-4y\right)-3y\left(x-4y\right)\)

\(=\left(x-3y\right)\left(x-4y\right)\)

Answer 2

\(x^2-7xy+12y^2\)

= \(x^2-4xy-3xy+12y^2\)

\(=\left(x^2-4xy\right)-\left(3xy-12y^2\right)\)

\(=x\left(x-4y\right)-3\left(x-4y\right)\)

\(=\left(x-3\right)\left(x-4y\right)\)

Answer 3

\(x^2-7xy+12y^2\)

= \(x^2-3xy-4xy+12y^2\)

= \(x\left(x-3y\right)-4y\left(x-3y\right)\)

= \(\left(x-3y\right)\left(x-4y\right)\)