1)(1-2x)(2x+1)=-2x(3x+1)+2
2x+1-4x-2x=-6x-2x+2
-4x+8x=2-1
4x=1
x=0,25
2)5a(a+1)=(3a-2)^2
5a^2+5a=9a^2-12a+4
5a^2+5a-9a^2+12a-4=0
-4a^2+17a-4=0
a=-4 b=17 c=-4
D=b^2-4ac=289-4×(-4)×(-4)=289-64=225
a1=(-b-√D)/2a=(4-15)/-8=-11/-8=11/8=1,375
a2=(-b+√D)/2a=(4+15)/-8=19/-8=-2,375