Question

помогитееееее плииииззз

Answer 1

$100*0,3^{2x}+91*0,3^{x}-9=0\\100*(0,3^{x})^{2}+91*0,3^{x}-9=0\\100t^{2}+91t-9=0\\t=-1, t=\frac{9}{100}\\0,3^{x}=-1; 0,3^{x}=\frac{9}{100}\\x=2$