(x-4)(x+12)≥(x+4)²-7
x²+12x-4x-48≥x²+8x+16-7
x²+8x-48≥x²+8x+9
8x-48≥8x+9
-48≥9
x∈∅
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(x-4)(x+12)≥(x+4)²-7
x²+12x-4x-48≥x²+8x+16-7
x²+8x-48≥x²+8x+9
8x-48≥8x+9
-48≥9
x∈∅