ini gimana kak?? no 5 sm 6

5. f(x) = ax + b
f(-2) = 7
a(-2)+b=7
f(3)=-3
a(3)+b=-3

-----------------
-2a+b=7
3a+b=-3
————— –
-5a = 10
a = -2
3(-2)+b = -3
-6+b=-3
b=-3+6
= 3

f(x) = -2x+3

6.f(x) = x²+ax+b
f(2)=5
f(1)=0

a) nilai a dan b
= f(2) => 2²+a(2)+b = 5
= f(1) => 1²+a(1)+b = 0

4+2a+b=5 => 2a+b = 1
1+1a+b=0. => a+b =-1
————— –
a=2
2(2)+b = 1
b= 1+(-4)=-3

b) f(x) = x²+2x-3
c) f(4) = 4²+2(4)-3 = 16+8-3=21

*semoga membantu ^^