\(4x^2-4x+1-16\)
\(=\left(2x-1\right)^2-4^2\)
\(=\left(2x+1\right)\left(2x-3\right)\)
\(4x^2-4x+1-16\)
\(=\left(2x\right)^2-2.x.2+1-4^2\)
\(=\left(2x-1\right)^2-4^2\)
\(=\left(2x-1-4\right).\left(2x-1+4\right)\)
\(=\left(2x-5\right).\left(2x+3\right)\)
Chúc bạn học tốt!