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).

Question

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).

eviant · Answer

@vocaloid 2x^3 + 5x^2 − x − 6?

Vocaloid · Answer

good

Zepdrix · Answer

$$\large\rm f=2x^2+x-3$$$$\large\rm \color{orangered}{g=x+2}$$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 · Answer

You shouldn't end up with a cubic.. third power... hmmm

Zepdrix · Answer

Oh is that multiply dot? Maybe I misread that :c dang

Vocaloid · Answer

oh I was treating • as multiplication not a composition

Vocaloid · Answer

their homework uses an open circle for composition notation

Zepdrix · Answer

oops :U

eviant · Answer

@Vocaloid it is multiplying not an  open circle
when I say (fog) that's an open circle

eviant · Answer

so, was my answer right?

Vocaloid · Answer

yes