Question

(13)^x+2 +5(13)^x+1 -(13)^x < 7

Answer 1

$(frac{1}{3} )^xcdot((frac{1}{3} )^2+5cdot(frac{1}{3} )-1) textless 7 \ \ (frac{1}{3} )^xcdot(frac{1}{9} +frac{15}{9} - frac{9}{9} ) textless 7 \ \ (frac{1}{3} )^xcdot(frac{7}{9}) textless 7$

$(frac{1}{3} )^x textless 9 \ \ (frac{1}{3} )^x textless ( frac{1}{3})^{-2} \ \x textgreater -2$