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2(x²+2.x.1+1²) < 3x²+6x-6
2(x²+2x+1) < 3x²+6x-6
2x²+4x+2 < 3x²+6x-6
2x²-3x²+4x-6x+2+6 < 0
-x²-2x+8 < 0
(-x+2)(x+4) < 0
-x+2 < 0
-x < -2
x > 2
atau
x+4 < 0
x < -4