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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 / -3
= a = 5
Jadi, nilai a = 5.