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Suatu fungsi didefinisikan dengan rumus f(x) = mx + n.Jikan f(0) = 4 dan f(–1) = 1, maka nilai f(–3) adalah...
Pembahasan
Rumus f(x) = mx + n
buat matrik
0 4
-1 1
masukan ke rumus
[Selisih kolom 1] F(x) = [selisih kolom ke 2]x + Determinan matrik
[0]-[-1] F(x) = [4-1]x + [0 - (-4) ]
1 F(x) = 3x + 4
F(x) = 3x + 4
Ditanya f (-3)
maka nilai f (–3) adalah f (x) = 3(-3)+ 4 = -9 + 4 =-5
Jadi, kesimpulanya nilai f (-3) yaitu -5