(6-x)·(6-x)-5x·(1-2x)>-(3x+4)·(3x-4)
(6-x)²-5x+10x²>-(9x²-16)
36-12x+x²-5x+10x²>-9x+16
36-17x+11x²>-9x²+16
36-17x+11x²+9x²-16>0
20-17x+20x²>0
20x²-17x+20>0
20x²-17x+20=0
x∈R
(6-x)·(6-x)-5x·(1-2x)>-(3x+4)·(3x-4)
(6-x)²-5x+10x²>-(9x²-16)
36-12x+x²-5x+10x²>-9x+16
36-17x+11x²>-9x²+16
36-17x+11x²+9x²-16>0
20-17x+20x²>0
20x²-17x+20>0
20x²-17x+20=0
x∈R