(3x-2)(3x+2)=77;
(3x)^2-(2)^2=77
9x^2-4=77
9x^2=81
x^2=9
x=-3
x=3
(x-4)^2 =25
(x-4)^-5^2=0
(x-4-5)(x-4+5)=0
(x-9)(x+1)=0
1)x-9=0
x=9
2)x+1=0
x=-1
1)9x^2-4=77
x=+3,-3
2) (x-4)^2=25
x-4=5
-(x-4)=5
ответ: 1) +3, -3;
2) -1; 9
(3x-2)(3x+2)=77;
(3x)^2-(2)^2=77
9x^2-4=77
9x^2=81
x^2=9
x=-3
x=3
(x-4)^2 =25
(x-4)^-5^2=0
(x-4-5)(x-4+5)=0
(x-9)(x+1)=0
1)x-9=0
x=9
2)x+1=0
x=-1
1)9x^2-4=77
9x^2=81
x^2=9
x=+3,-3
2) (x-4)^2=25
x-4=5
-(x-4)=5
x=-1
x-4=5
x=9
ответ: 1) +3, -3;
2) -1; 9