Question

( 2y -1)² =?
ándele porfa T_T​

Answer 1

• → (a - b)² = a² - 2ab + b²

= (2y - 1)²

= (2y)² - 2 · 2y · 1 + (1)²

= 4y² - 2 · 2y · 1 + 1

= 4y² - 4y · 1 + 1

= 4y² - 4y + 1