Respuesta :

wormynut
Now, in place of x, you'll have to substitute 3. So,
f(3)=2*3^2+3
=2*9+3
=18+3
=21.
gomezmjosemiguel

Answer:

The answer is f(3)=21.

Step-by-step explanation:

To solve this we have to replace the x value in the proposed equation with a value of 3.

[tex]f(x)=2x^{2} +3\\x=3\\Replacing\\f(3)=2*3^{2} +3\\f(3)=2*9+3\\f(3)=18+3\\f(3)=21\\[/tex]

Having replace the value we have that f(3)=21.