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f(-3)= (-3)×(-3)+6
=6+6
=12
bayangan (-3,12)
x=2
f(2)=(-3)×2+6
=(-6)+6
=0
bayangan (2,0)
f(a)=-9
f(x)=-3x+6
f(a)=-3a+6
-9 = -3(a)+6
-9=-3a+6
-9-6=-3a
-15=-3a
a=-15/-3
a=5
jadi nilai a=5