tolong bantu ya kak beserta oret2an nya

jawab 
Logaritma
19. bentuk a²-b² = (a +b)(a-b)

[²log² 8 - ²log² 2 ] / [ ²log√8 - ²log√2] =
= [ (²log 8+ ²log 2)(²log 8 - ²log 2)] /[²log√8 - ²log √2]
= [(²log 8 +²log 2)(²log√8+²log√2)(²log√8 -²log√2) ] / [²log√8 - ²log√2 ]
= (²log  8 + ²log 2)(²log √8+²log√2)
= (3+ 1)(3/2 + 1/2)
= 4(2)
 = 8

20.
ᵃlog x = 3  --> x = 3ᵃ
³ᵃlog y = 3 --> y = 3³ᵃ


y/x = (3)³ᵃ / (3)ᵃ
y/x = ( 3³. 3ᵃ) / (3ᵃ)
y/x = 3³
y/x = 27

ᵃᵃᵃᵃᵃᵃ