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f(x)=4x-n
f(3)=7
jawaban:
a). f(3) =4×3-n
7 =12-n
7-12 = -n
-5 = -n
n = 5
b). f(-5) = 4 × (-5) - 5
= -20 - 5
= -25
semoga bermanfaat ^^