Question

log 17(x 2+x-7)=log 17(-x+1)

Answer 1

$log _{17}(x^2+x-7)=log_{ 17}(-x+1)\ \ left { {{-x+1>0} atop {x^2+x-7=-x+1}} right. Leftrightarrow left { {{x<1} atop {x^2+2x-8=0}} right. Leftrightarrow left { {{x<1} atop {x_{1,2}=-4; 2}} right. Leftrightarrow x=-4 \ \ OTBET: -4$