(8x+1)(2x-3)-1=(4x-2)^2 16x^2-24x+2x-3-1=16x^2-16x+4 16x^2-16x^2-24x+2x+16x=3+1+4 16x+2x-24x=8 -6x=8 x=-6:8 x=-0,75