diketahui fungsi f= x→1/2(x+3) jika f(a)→4,maka tentukan nilai a #tolong bantu saya

Question

Matematika Diposting : 2017-10-12 Diupdate : 2017-10-12 iskandar36

Pertanyaan

diketahui fungsi f= x→1/2(x+3)
jika f(a)→4,maka tentukan nilai a
#tolong bantu saya

Answer 1

f(x) = 1/2(x + 3)

f(a) = 4
1/2(a + 3) = 4
a + 3 = 4 x 2
a + 3 = 8
a = 8 - 3
a = 5

Answer 2

dik: f(x) = 1/2 (x+3)
f(a) = 4
dit: a?
penye:
f(a) = 1/2 (x+3) = 4
1/2 (x+3) = 4
x+3 = 8
x= 8 - 3 = 5

jadi, a = 5