Simplify: 4x2−12x−1\dfrac{4x^2 - 1}{2x - 1}2x−14x2−1 (assume x≠12x \neq \frac{1}{2}x=21).
2x+12x + 12x+1
2x−12x - 12x−1
4x+14x + 14x+1
4x−24x - 24x−2