Tolong jabab in ya kak yang nomor 28,29,30 besok di kumpul kak makasih..

Awak boleh tolong saya tak

27) f(5) = -5(5)+2 = -(25-2) = -23
f(-5) = -5(-5)+2 = 25+2 = 27
jawaban : b

28) f(0) = 1
b = 1
f(-1) = -a + 1 = 3
-a = 2
a = -2
f(x) = -2x + 1
jawaban : b

29)
f(3) = 3a + b = 2
f(-2) = -2a + b = -8
================ –
5a = 10
a = 2
3(2) + b = 2
b = 2-6
b = -4
f(x) = 2x -4
jawaban : d

30) f(x) = 5 – 2x
f(x) + f(x-1)
= 5 – 2x + 5 – 2(x-1)
= 10 +2 – 4x
= 12 – 4x
= -4x + 12
jawaban : c