Respuesta :

ANSWER:

-4.1201

SOLUTION

[tex]\log _b\frac{1}{4}=\log _b1-\log _b4[/tex]

this is also equivalent to

[tex]\log _b\frac{1\times7}{4\times7}=\log _b\frac{7}{28}=\log _b7-\log _b28=5.7833-9.9034=-4.1201[/tex]