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eviant:
The domain for f(x) and g(x) is the set of all real numbers. Let f(x) = 2x2 + x − 3 and g(x) = x + 2. Find (f • g)(x).
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eviant:
@vocaloid 2x^3 + 5x^2 − x − 6?
Vocaloid:
good
Zepdrix:
\[\large\rm f=2x^2+x-3\]\[\large\rm \color{orangered}{g=x+2}\]Then,\[\large\rm f(\color{orangered}{g})=2\color{orangered}{g}^2+\color{orangered}{g}-3\]\[\large\rm f(\color{orangered}{g})=2\color{orangered}{(x+2)}^2+\color{orangered}{(x+2)}-3\]
Zepdrix:
You shouldn't end up with a cubic.. third power... hmmm
Zepdrix:
Oh is that multiply dot? Maybe I misread that :c dang
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Vocaloid:
oh I was treating • as multiplication not a composition
Vocaloid:
their homework uses an open circle for composition notation
Zepdrix:
oops :U
eviant:
@Vocaloid it is multiplying not an open circle when I say (fog) that's an open circle
eviant:
so, was my answer right?
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Vocaloid:
yes
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