5. Diketahui :
f(x) = x – 3
g(x) = 2x2 – 6x
b(x) = x2 – 9
m(x) = 2x2 – x – 15
f(x) . g(x) = … .
A. 2x3 – 12x2 – 18
B. 2x3 – 12x2 + 18x
C. 2x3 – 12x2 – 18x
D. 2x2 – 18x
E. 2x3 – 18x
f(x) = x – 3
g(x) = 2x2 – 6x
b(x) = x2 – 9
m(x) = 2x2 – x – 15
f(x) . g(x) = … .
A. 2x3 – 12x2 – 18
B. 2x3 – 12x2 + 18x
C. 2x3 – 12x2 – 18x
D. 2x2 – 18x
E. 2x3 – 18x
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Penjelasan dengan langkah-langkah:
f(x).g(x) = (f x g)(x)
f(x) = x - 3
g(x) = 2x² - 6x
= (x - 3)(2x² - 6x)
= 2x³ - 6x² - 6x² + 18x
= 2x³ - 12x² + 18x