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Maka
f(x) = 3x² - 1
Nomor Empat
f(x) = ax^2 + b
f(0) = -1
-1 = a(0)^2 + b
-1 = b
f(-4) = 47
47 = (-4)^2 a + b
47 = 16a + (-1)
48 = 16a
a = 48/16
a = 3
rumus fungsi f(x) = 3x^2 - 1
no 4)
f(x) = 5x-2
a) rumus fungsi = f(x) = 5x-2
b) jika x-3 maka nilai f(x) = ..?
f(x-3) = 5(x-3) - 2
= 5x - 15 -2
= 5x - 17