\(\left(2x+1\right)^4-3\left(2x+1\right)^2+2\)
\(=\left[\left(2x+1\right)^2\right]^2-2.\left(2x+1\right)^2.\dfrac{3}{2}+\dfrac{9}{4}-\dfrac{1}{4}\)
\(=\left[\left(2x+1\right)^2-\dfrac{9}{4}\right]^2-\left(\dfrac{1}{2}\right)^2\)
\(=\left[\left(2x+1\right)^2-\dfrac{9}{4}+\dfrac{1}{2}\right].\left[\left(2x+1\right)^2-\dfrac{9}{4}-\dfrac{1}{2}\right]\)
mình ko chắc là có đúng ko nếu có sai thì mong bạn nào đó giúp mình