Question 673352
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Hi,
2x³+6x²-20x= 2x (x²+3x-10)= 2x(x+5)(x-2)
2x(x+5)(x-2)=0 
  2x = 0   x = 0
0r (x+5)= 0   x = -5
0r (x-2)=0    x = 2 
solution set {-5, 0, 2} is correct.  Good work!