tolong jawab pakai cara ya. terima kasih

MAPEL = MATEMATIKA
KELAS = 8
BAB = RELASI & FUNGSI

diketahui :
- rumus fungsi ➡ g(x) = ( 2x - 7 )/( ax + 8 )
- g(-1) = -3

ditanya : nilai a + 2 ??

----------- Fungsi ------------

g(x) = g(-1)
subtitusi nilai x dengan -1

g(x) = ( 2x - 7 )/( ax + 8 )
g(-1) = ( 2(-1) - 7 )/( a(-1) + 8 ) = -3
➡ ( -2 - 7 )/( -1a + 8 ) = -3
➡ ( -9 )/( -1a + 8 ) = -3
➡ -9 = 3a - 24
➡ -9 + 24 = 3a
➡ 15 = 3a
➡ a = 15/3
➡ a = 5

nilai a + 2 :
= 5 + 2
= 7

jawaban C.
semoga membantu