1)(x-5)^2=3x^2-x+14
x^2-10x+25=3x^2-x+14
x^2-10x+25-3x^2+x-14=0
-2x^2-9x+11=0×(-1)
2x^2+9x-11=0
D=(9)^2-4×2×(-11)=81+88=169=13
x1=-9+13/2×2=4/4=1
x2=-9-13/2×2=-22/4=-5,5
2)9x(4x-1)=3x-1
36x^2-9x=3x-1
36x^2-9x-3x+1=0
36x^2-12x+1=0
D=(-12)^2-4×36×1=144-144=0
x1=12+0/36×2=12/72=1/2=0,5
x2=12-0/36×2=12/72=1/2=0,5