Jika $f(x)=\frac{2}{3}x-6$ dan $g(x)=2x+\frac{1}{2}$, maka $(g o f)(x)=$ ...
A. $\frac{4}{3}x+\frac{23}{2}$
B. $\frac{4}{3}x-\frac{23}{2}$
C. $\frac{4}{3}x-\frac{17}{3}$
D. $\frac{4}{3}x+\frac{17}{3}$
E. $\frac{4}{3}x-\frac{16}{3}$
Jawab;
$(g of)(x)=g(f(x))=g\left(\frac{2}{3}x-6\right)$
$=2\left(\frac{2}{3}x-6\right)+\frac{1}{2}$
$=\frac{4}{3}x-12+\frac{1}{2}$
$=\frac{4}{3}x-\frac{12\times 2}{2}+\frac{1}{2}$
$=\frac{4}{3}x-\frac{24}{2}+\frac{1}{2}$
$=\frac{4}{3}x-\frac{23}{2}$
Sumber Soal : Mandiri Matematika Jilid 1 untuk SMA/MA Kelas X Kelompok Wajib Halaman 93 No soal 78.
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