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11=-p+q
f2=2p+q
-7=2p + q
Pake eliminasi
-7=2p+q
11=-p+q
p=-6 q=5
f-3= 18+5=23
F(-1)=11
f(2)=-7
f(-3)=x
Rumus= px+q
= -px+q=11 <== F(-1)
=2px+q=-7 <== F(2)
Ket: mencari F(3) dengan cara substitusi
-px+q=11
2px+q=-7
-3px=18
px= 18/-3 = -6
= 2(-6)+q=-7
=-12+q=-17
q=-17+12
q=5
F(3)= (-3)px(-6)+q(5)=x
x={-3x(-6))+5
x=18+5
x=23
sorry kelamaan jawab