Diketahui rumus fungsi f (x) = 4 x -2 .jika f (a) = 8 dan f (-2) = b maka nilai a + b adalah.... Please bantu jawab dong aku gk ngerti

Question

Matematika Diposting : 2018-01-23 Diupdate : 2020-10-08 laila0606

Pertanyaan

Diketahui rumus fungsi f (x) = 4 x -2 .jika f (a) = 8 dan f (-2) = b maka nilai a + b adalah....

Please bantu jawab dong aku gk ngerti

Answer 1

f(x) = 4x-2
f(a) = 8
4a -2 =8
4a = 10
a = 5/2

f(-2) = b
4(-2) -2 =b
-10 =b

a+b = 5/2 -10 = -7,5