pra kwn tlnk bntu sy dong krjakan soal yg di ats ad 2 nmr kwn...tks yg sdh mau bntu

Mapel : Matematika
Kelas : XI SMA
Bab : Fungsi Komposisi dan Fungsi Invers , Barisan dan Deret

Pembahasan :
19||

f(x) = (3x + 4)/2
y = (3x + 4)/2
2y = 3x + 4
3x = 2y - 4
x = (2y - 4)/3
f¯¹(x) = (2x - 4)/3
f¯¹(x) = 2/3x - 4/3
f¯¹(x) = 2/3(x - 2)

Opsi A.

20||

Beda = (U10 - U2)/(10 - 2)
Beda = (39 - 7)/8
Beda = 32/8
Beda = 4

U2 = a + b
7 = a + 4
a = 3

Maka...
U55 = a + 54b
U55 = 3 + 54(4)
U55 = 3 + 216
U55 = 219

Nomor 19
f(x) = (3x + 4) / 2
y = (3x + 4) / 2
2y = 3x + 4
3x = 2y - 4
x = (2y - 4) / 3

f`¹(x) = (2x - 4) / 3
f`¹(x) = ⅔ (x - 2)

Opsi A

Nomor 20
U2 = a + b = 7
U10 = a + 9b = 39
______________-
-8b = -32
b = 4

a + b = 7
a = 7 - 4
a = 3

U55 = a + 54b
U55 = 3 + 54.4
U55 = 3 + 216
U55 = 219

Opsi gak ada

Semoga berguna +_+