Which expression is equivalent to (3/5 x-7) (-1/5x 1/2)?
1) (3/25 x² + 7/5 x - 7/10)
2) (3/25 x² - 7/5 x + 7/10)
3) (-3/25 x² + 7/5 x - 7/10)
4) (-3/25 x² - 7/5 x + 7/10)