Apakah nilai g [f (4)] jika f (x) = 5x dan g (x) = 3x-7?

Apakah nilai g [f (4)] jika f (x) = 5x dan g (x) = 3x-7?
Anonim

Jawapan:

# g (f (4)) = 53. #

Penjelasan:

# f (x) = 5x rArr f (4) = 5 * 4 = 20. #

Sekarang, #g (f (4)) = g (20). #

Tetapi, #g (x) = 3x-7:. g (20) = 3 * 20-7 = 60-7 = 53. #

# rArr g (f (4)) = g (20) = 53. #

Jawapan:

#g (f (4)) = 53 #

Penjelasan:

# "bermula dengan menilai" f (4) #

#rArrf (warna (merah) (4)) = 5xxcolor (merah) (4) = 20 #

# "kini mengevaluasi" g (x) "dengan" x = 20 #

#rArrg (warna (magenta) (20)) = 3xxcolor (magenta) (20) -7 = 60-7 = 53 #