diketauhi f (3x+1) =6x+3 tentukanlah a.rumus fungsi b.nilai 3f(-2) c.nilai t jika f (5t)=1

f(3x+1) = 6x+3
f(3x+1) = 6(3x+1) + 3
= 18x + 6 + 3
= 18x + 9
a. f(x) = 18x + 9
b. f(-2) = 18(-2) + 9
= -36 + 9
= -27
3f(-2) = 3(-27)
= -81
c. f(5t) = 1
f(5t) = 18(5t) + 9
1 = 90t + 9
1 - 9 = 90t
-8 = 90t
-8/90 = t
-8/45 = t

**bener gini nggak yaa?