Объяснение:

8.

[tex](3x - 5 {)}^{2} - 49 = 0[/tex]

(3х-5-7)(3х-5+7)=0

(3х-12)(3х+2)=0

3х-12=0 або 3х+2=0

х=4 х=-2/3

А),Б)

9.

[tex]0.09 - {x}^{128} = (0.3 - {x}^{64}) (0.3 + {x}^{64} )[/tex]

[tex]81 {y}^{98} - 121 {x}^{32} = (9 {y}^{49} - 11 {x}^{16} )(9 {y}^{49} + 11 {x}^{16} )[/tex]