Diketahui fungsi f:x 4x-1 tentukan A.f(3) B.f(-3) C.Bayangan (-5) oleh f D.nilai f jika x=4 E.nilai x jika f (x)=15 F.nilai A jika f(a)=23

Dijawab :
A. x = 3
f (3) = 4 . 3 - 1
f (3) = 12- 1 = 11
B. x = - 3
f (-3) = 4 . -3 - 1
f (-3) = -12 - 1 = 11
C. f(-5) = 4 . -5 - 1
f(-5) = -20 - 1 = 19
D.f(x) = 4.
f(x) = 4x - 1
4. = 4x - 1
4 + 1 = 4x
5. = 4x
4x = 5
x = 5/4 = 1,25
E. f(x) = 15
f (x) = 4x - 1
15 = 4x - 1
15 + 1 = 4x
16 = 4x
4x =16
x. = 16/4 = 4
F. f(a) = 23
f(a) = 4a - 1
23 = 4a - 1
23 + 1 = 4a
24. = 4a
4a = 24
a. = 24/4 = 6

semoga membantu ya ^-^.