Posted by pavleen on Monday, March 14, 2011 at 7:28pm.
4x(x - 5) - 5x(x - 4) = -1 4x*x - 4x*5 - 5x*x - 5x*-4 = -1 4x^2 - 20x - 5x^2 + 20x = -1 -x^2 = -1 x^2 = 1 x = 1, x = -1 So the answer is x = 1 or x = -1. I hope that helps! :)