Diketahui f(x) = x + 3 ,g(x) = 2 x pangkat 2 -x Carilah = a) gof(x) b)fog(x) c)fog(6)

f(x) = x + 3
g(x) = 2x² -x

a) gof(x) = g(f(x))
. gof(x) = 2(f(x))² - f(x)
. gof(x) = 2(x+3)² - (x+3)
. gof(x) = 2(x²+6x+9) - (x+3)
. gof(x) = 2x²+12x+18 -x-3
. gof(x) = 2x²+12x-x+18-3
. gof(x) = 2x²+11x+15

b) fog(x) = f(g(x))
. fog(x) = g(x) + 3
. fog(x) = 2x² -x + 3

c) fog(6) = 2x² -x + 3
. fog(6) = 2(6)² -(6) + 3
. fog(6) = 2(36) -(6) + 3
. fog(6) = 72 - 6 + 3
. fog(6) = 69

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