2(3x+5)^2=7(3x+5)
2(9x^2+30x+25)=21x+35
18x^2+60x+50=21x+35
18x^2+60x-21x=35-50
18x^2+39x=-15
18x^2+39x+15=0
D=39^2-4*18*15=1521-1080=441
X(1)=-39-21/2=-30
X(2)=-39+21/2=-9
Ответ: -9;-30
9(2х+3)^2-25=0
9(4х^2+12+9)-25=0
36x^2+108x+81-25=0
36x^2+108x+56=0
D=108^2-4•36•56=11664-144•56=11664-8064=3600
X(1)=-108-60/2•36=-168/72~-2,3
X(2)=-108+60/2•36=-48/72~-0,7
Ответ: ~-0,7; ~-2,3
(3х-1)^2=4-12х
9х^2+6х-3=0
D=6^2-4•9(-3)=36+108=144
X(1)=-6-12/2•9=-18/18=-1
X(2)=-6+12/2•9=6/18~0,3
Ответ: -1; 0,3