1) \(x^2-5x-6=x^2-6x+x-6\)
\(=\left(x^2-6x\right)+\left(x-6\right)\)
\(=x\left(x-6\right)+\left(x-6\right)\)
\(=\left(x-6\right)\left(x+1\right)\)
2) \(2x^2-4xy+2y^2=2x^2-2xy-2xy+2y^2\)
\(=\left(2x^2-2xy\right)-\left(2xy-2y^2\right)\)
\(=2x\left(x-y\right)-2y\left(x-y\right)\)
\(=\left(x-y\right)\left(2x-2y\right)\)
\(=\left(x-y\right).2\left(x-y\right)\)
\(=2\left(x-y\right)^2\)
HỌC TỐT NHA !!
\(x^2-6x+x-6\)
\(\left(x^2-6x\right)+\left(x-6\right)\)
\(x\left(x-6\right)+\left(x-6\right)\)
\(\left(x-6\right)\left(x+1\right)\)
\(x-6=0\) hoặc \(x+1=0\)
\(x=6\) hoặc \(x=-1\)
câu a mình làm dư bạn chép tới khúc (x-6)(x+1) là đc r
\(2x^2-2xy-2xy+2y^2\)
\(\left(2x^2-2xy\right)-\left(2xy-2y^2\right)\)
\(2x\left(x-y\right)-2y\left(x-y\right)\)
\(\left(x-y\right)\left(2x-2y\right)\)
\(\left(x-y\right)\left(x-y\right).2\)
\(2\left(x-y\right)^2\)
