Question 415136
when you substitute -1 for x, you get the following:


original equation:


(x-2)*(3x) + (2x-1)*(x+4) = (5x-1)*(x+1)


when you replace x with -1:


(x-2)*(3x) becomes -3*-3 which equals 9
(2x-1)*(x+4) becomes -3*3 which equals -9
(5x-1)*(x+1) becomes -6*0 which equals 0


the equation becomes:

9 - 9 = 0 which becomes 0 = 0 which is true.


they are equal because when you substitute (-1) for x, the equation becomes 0 = 0 which is true.