(2x-1)^2-(1-3x)^2<5(1-x)(x+1)4x²-4x+1-9x²+6x-1<5-5x²2x<5x<5/2
(2x-1)^2-(1-3x)^2<5(1-x)(x+1)[(2x-1)-(1-3x)][(2x-1)+(1-3x)]<5(1-x)(x+1)(2x-1-1+3x)(2x-1+1-3x)<5(1-x)(x+1)-x(5x-2)<5(1-x^2)-5x^2+2x<5-5x^22x<5x<5/2