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(-3)= -3.-3+6
=9+6
=15. (bayangan -3)
apabila bayangan-2
f(x) =-3x+6
(-2)=-3.2+6
=-6+6
= 0
b) f(x)=-3x+6
f(a)=-3a+6
-9 = -3a+6
-9-6=-3a
-15=-3a
a= -15/-3
=5
f( -3) = -3(-3) +6
= 9 +6
= 15
f(x) = -3x +6
f(2)= -3(2) +6
= -6 +6
= 0
b. f(x) = -3x +6
f(a) = -3(a) +6 = -9
= -3a +6 = -9
= -3a = -9 -6
= -3a = -15
= a = -15 / -3
= a = 3
jadi, nilai a jika f(a) = 9 adalah 3.