Question

Log 0,2 (2x+5) = 1
A) 3,4
B) -2,4
D) 2,4

Answer 1

$log_{0.2} (2x+5)=1 \\ log_{0.2} (2x+5)=log_{0.2} 0.2\\ 2x+5=0.2 \\ 2x=-4.8 \\x=-2.4$