(5x-2)2-(2x-1)2=(5x-2-2x+1)(5x-2+2x-1)=(3x-1)(7x-3)
(5x - 2)² - (2x - 1)²
= (5x - 2 + 2x - 1) (5x - 2 - 2x + 1)
= (7x - 3) (3x - 1)
\(\left(5x-2\right)^2-\left(2x-1\right)^2\)
\(=\left(5x-2-2x+1\right)\left(5x-2+2x-1\right)\)
\(=\left(3x-1\right)\left(7x-3\right)\)