Проверьте, пожалуйста, на правильность)
(x-3)(x+3)>3(x-2)^2-4x(x-2)
(x^2-9)>3(x^2-4x+4)-4x^2+8x
x^2-9>3x^2-12x+12x-4x^2+8x
2x^2+4x-21=0
D=16+168=184
x1=-4+√184/4=-4+2√46/4
x2=-4-2√46/4
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