Question

(PUC-RS) Se log 5 = x e log 3 = y, então log 375 é:
a) y + 3x
b) y + 5x
c) y - x +3
d) y - 3x + 3
e) 3(y + x)

Answer 1

$\log375=\\\\\log(3\cdot5^3)=\\\\\log3+\log5^3=\\\\\log3+3\cdot\log5=\\\\\boxed{y+3x}$