Question

Să se rezolve ecuaţia:
$log_{3} (x+1) + log_{5}(x-3) = 3$

Answer 1

log3(8+1)+log5(8-3) = 3
log3(9)+log5(5) = 3
2+1=3
3=3(A) ⇒ x=8 solutie
S={8}