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f(n) = 8 +3(n) = -7
= 8 +3n = -7
= 3n = -7 -8
= 3n = -15
= n = -15/3
= n = -5
Itu jawabannya.
f(n) = -7
maka :
f(x) = 8 + 3x
f(-7) = 8 + 3 (n)
-7 = 8 + 3n
-15 = 3n
n = -15/3
n =- 5