Question

2log5 (x) +log5 (16) =4
Как решить??

Answer 1

2log5 (x) +log5 (16) =4

2 log5(x)+log5(16)=4,х>0

log5(x^2)+log5(16)=4

log5(x^2*16)=4

log5(16x^2)=4

16x^2=625

x=25/4= 6 1/4=6.25