So log2(4/8) = log2(4) − ?

Question

log₂ (4/8) = log₂(4) − ?

Please help, I'm confuse with plugging where into where. Thank you!

Answer 1

$lo{g}_2\frac{4}{8}$ = $lo{g}_2\frac{1}{2}=-1$

$lo{g}_{2}4=$ 2

-1 = 4 - 3