3) \(=x^2-\left(y^2+2yz+z^2\right)\)
\(=x^2-\left(y+z\right)^2=\left(x-y-z\right)\left(x+y+z\right)\)
4) \(=\left(x^2-2x+1\right)-\left(4y^2+4y+1\right)=\left(x-1\right)^2-\left(2y+1\right)^2\)
\(=\left(x-1-2y-1\right)\left(x-1+2y+1\right)=\left(x-2y-2\right)\left(x+2y\right)\)
5) \(=x^2\left(x-4\right)-9\left(x-4\right)=\left(x-4\right)\left(x^2-9\right)\)
\(=\left(x-4\right)\left(x-3\right)\left(x+3\right)\)
6) \(=\left(x^2-10x+25\right)-16y^2=\left(x-5\right)^2-16y^2\)
\(=\left(x-5-4y\right)\left(x-5+4y\right)\)
7) \(=m\left(x-y\right)-\left(x-y\right)=\left(x-y\right)\left(m-1\right)\)
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