a. -17 b. -9 c. 9 d. 17 e. -1

Kelas 10 Matematika
Bab Logaritma

^ = pangkat

^3log y = ^3log (x + 1)
y = x + 1

2 . ^3log y = ^3log (x + 1) + 2
^3log y² = ^3log y + ^3log 3²
^3log y² = ^3log y + ^3log 9
^3log y² = ^3log 9y
y² = 9y
y² - 9y = 0
y (y - 9) = 0
y = 0

y = x + 1
0 = x + 1
x = -1

y - 9 = 0
y = 9

y = x + 1
9 = x + 1
x = 9 - 1
x = 8

Syarat :
y > 0

x + 1 > 0
x > -1

yang memenuhi, x = 8 dan y = 9

x + y = 8 + 9
x + y = 17

✩✩ D ✩✩