diketahui fungsi f:x = 1/2(5-x) tentukan a. rumus fungsi f b. nilai fungsi f, jika x = -3 dan x = 9 c. nilai a jika f(a) = 6

a] f(x) = 1/2(5 - x)

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

f(x) = 1/2(5 - x)
f(9) = 1/2(5 - 9)
f(9) = 1/2(-4)
f(9) = -2


c]
f(x) = 1/2(5 - x)
f(a) = 1/2(5 - a)
6 = 1/2(5 - a)
6 × 2 = 5 - a
12 = 5 - a
a = 5 - 12
a = -7