(5x-2)^2-15>(4x-10)^2+9x^2
25x^2-20x+4-15>16x^2-80x+100+9x^2
25x^2-20x-11>25x^2-80x+100
25x^2-25x^2-20x+80x-11-100>0
60x-111>0
60x>111
x>1, 85
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5x-2-15>(4x-10)^2+9x^2
5x-17> 16x^2-80x+100+9x^2
5x-17> 25x^2-80x+100
-25x^2+5x+80x-17-100>0
25x^2-85x+17 <0
D=(-85)^2-4*25*117=7225-1170=нет корней