Question

cum se rezolva acest exercitiu.....7ˣ⁻²=4

Answer 1

Răspuns:

$7^{x-2}=4,~7^{x-2}=7^{log_{7}4},~deci~x-2=log_{7}4,~x=2+log_{7}4=log_{7}7^{2}+log_{7}4=log_{7}(49*4)=log_{7}396.\\x=log_{7}396.$

Explicație pas cu pas: