Question

\(25-x^2-y^2+2xy\)

phân tích đa thức thành nhân tử

Answer 1

\(=25-\left(x^2+y^2-2xy\right)\)

\(=25-\left(x-y\right)^2=\left(5-x+y\right)\left(5+x-y\right)\)

Answer 2

\(25-x^2-y^2+2xy\) 
\(=\left(x-y\right)^2-5^2\) 
\(=\left(x-y-5\right)\left(x-y+5\right)\)

Answer 3

\(=25-(x^2-2xy+y^2)=5^2-(x-y)^2=(5-x+y)(5+x-y)\)