dik: f(x) = 3x - 3, g(x) = 4x + 7, dan h(x) = 2 - 8x (utk soal 14-18) 14. (fog)(x)= 15. (goh)(x)= 16. (hof)(X)= 17. (fogoh)(x)= 18. (gof)(3)=

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Diketahui :
f(x) = 3x - 3
g(x) = 4x + 7
h(x) = 2 - 8x

Nomor 14
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(fog)(x) = f(g(x))
= 3.(4x + 7) - 3
= 12x + 21 - 3
= 12x + 18

Nomor 15
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(goh)(x) = g(h(x))
= 4.(2 - 8x) + 7
= 8 - 32x + 7
= 15 - 32x

Nomor 16
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(hof)(x) = h(f(x))
= 2 - 8.(3x - 3)
= 2 - 24x + 24
= 26 - 24x

Nomor 17
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(fogoh)(x) = f(g(h(x)))
= 3.(15 - 32x) - 3
= 45 - 96x - 3
= 42 - 96x

Nomor 18
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(gof)(x) = g(f(x))
= 4.(3x - 3) + 7
= 12x - 12 + 7
= 12x - 5

maka :
 (gof)(3) = g(f(3))
= 12.(3) - 5
= 36 - 5
= 31

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