Question

Lg (4x+5) - Lg (5x+2) = 0

Answer 1

lg (4x+5)=lg(5x+2)                   OD  4x+5>0? x>-5/4                                          

4x+5=5x+2                                              5x+2>0? x>-2

4x-5x=2-5

-x=-3

x=3 ответ х=3