Tlg donk tinggal caranya lagi nih pusing, makasih sebelumnya

No.23
f(x) = 7 - 2x - 3x²
f(-3) = 7 - 2(-3) - 3(-3)²
f(-3) = 7 + 6 - 27
f(-3) = -14

No.24
f(x) = 2x - 3

f(a) = 2a - 3
3 = 2a - 3
2a = 6
a = 3

f(b) = 2b - 3
-5 = 2b - 3
2b = -2
b = -1

f(-2) = c
2(-2) - 3 = c
-4 - 3 = c
-7 = c

f(-1) = d
2(-1) - 3 = d
-2 - 3 = c
-5 = d

a + b + c - d
= 3 - 1 - 7 + 5
= 0

No. 25
f(x) = ax + b

f(-2) = -2a + b = 14
f(3) = 3a + b = -1
       ---------------------- (-)
             5a = -15
              a = -3

3a + b = -1
3(-3) + b = -1
b = -1 + 9
b = 8

No. 26
f(x) = 3x - 2

f(a) = 3a - 2
19 = 3a - 2
3a = 21
a = 7

No.27
f(x) = 3x - 18
tipot dengan sumbu x pada saat f(x) = 0
3x - 18 = 0
3x = 18
x = 6

jadi tipot = (6,0)

No.28
f(x) = 3x - 5
Df = {-3,-2,-1,0,1,2}
Rf = {-14 , -11 , -8 , -5 , -2 , 1}

No.29
x - 2y = 10
3x + 2y = -2
---------------- (+)
4x = 8
x = 2

x - 2y = 10
2 - 2y = 10
2y = 2 - 10
2y = -8
y = -4

HP = {(2 , -4)}

maaf ya kak aku cuma bisa 2 nomer aja