Jika f(x) = x + 5, g(x) = x2 + 3x – 5, dan h(x) = 5 – 2x. Nilai (fogoh)(2) =
Jika f(x) = x + 5, g(x) = x2 + 3x – 5, dan h(x) = 5 – 2x. Nilai (fogoh)(2) = ….
Jawab:
h(2) = 5 – 2(2) = 5 – 4 = 1
(goh)(2) = g(h(2))
= g(1)
= 12 + 3(1) – 5
(goh)(2) = -1
(fogoh)(2) = f((goh)(2))
= f(-1)
= -1 + 5
(fogoh)(2) = 4
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