Question

Помогите решить ! Срочно !

Answer 1

(1/7)^2х-1=(1/7)^-2

2х-1=-2

2х=-1

х=-0.5

Answer 2

$(frac{1}{7})^{2x-1}=49 \ (frac{1}{7})^{2x-1}=(frac{1}{7})^{-2} \ 2x-1=-2 \ 2x=-1 \ x=-0.5$