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! :)
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