Answer:
4) x = 3/2 , x = -1/2
Steps:
(2x-1)² - 4 = 0
4x²-4x+1 - 4 = 0
4x²-4x-3 = 0
x = (4±√((-4)²-4×4×(-3))/2×4
x = (4±√(16+48)/8
x = (4±√(64)/8
x = (4±8)/8
x = 12/8 , x = -4/8
x = 3/2 , x = -1/2
