Question

Rút gọn :

(2x + 1)² + (3x – 1)² + 2(2x +1)(3x – 1)

Answer 1

\(\left(2x+1\right)^2+\left(3x-1\right)^2+2\left(2x+1\right)\left(3x-1\right)\)
\(=\left(2x+1\right)^2+2\left(2x+1\right)\left(3x-1\right)+\left(3x-1\right)^2\)

\(=\left[\left(2x+1\right)+\left(3x-1\right)\right]^2\)