# What is the standard form of y= (5x - 1)^2 ?

$y = \left(5 x - 1\right) \left(5 x - 1\right)$
$y = 25 {x}^{2} - 5 x - 5 x + 1$
$y = 25 {x}^{2} - 10 x + 1$