x^2-2x=x+4

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x^2 - 2x = x + 4    :move everything to left sidex^2 - 3x - 4 = 0     :factor, it works for -4 and +1(x - 4)(x + 1) = 0  : x can be 4 or -1 to make this equation truex = 4, -1You asked this question on an absolute value video, is there a reason for that?  You might want to watch this set of videos for more in depth information:http://www.brightstorm.com/d/math/s/algebra/u/factoring-2/t/factoring-trinomials-a-equals-1You can also watch the other topics in the factoring series, they will help you learn how to factor in special cases.