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Jika f(x) = x + 5, g(x) = x2 + 3x – 5, dan h(x) = 5 – 2x. Nilai (fogoh)(2) =

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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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