(2x - b)^2 = (2x - b)(2x - b)= 2x 2x + 2x (-b) - b 2x - b (-b)= 4x^2 - 2bx - 2bx + b^2= 4x^2 - 4bx + b^2
(2x - b)^2 = (2x - b)(2x - b)
= 2x 2x + 2x (-b) - b 2x - b (-b)
= 4x^2 - 2bx - 2bx + b^2
= 4x^2 - 4bx + b^2