(2x+1) (To solve the equation (2x+1)(2x-1)=-3, we need to expand the expression on the left side and then solve for x. Let's start by using the distributive property to expand the expression: (2x+1)(2x-1) = 4x^2 - 2x + 2x - 1 = 4x^2 - 1 Now, we can set the expanded expression equal to -3: 4x^2 - 1 = -3