Question

If f(x) = 2x2 + 2, find f(5).

Answer 1

^2

Answer 2

2x^2

Answer 3

Plug in 5 for x, and find out.

Answer 4

\(\normalsize\color{blue}{ f(x)=2x^2+2}\)
\(\normalsize\color{blue}{ f(2)=2(2)^2+2~~~~~~~⇒~~~~~~~f(2)=10}\)
\(\normalsize\color{blue}{ f(3)=2(3)^2+2~~~~~~~⇒~~~~~~~f(3)=20}\)
\(\normalsize\color{blue}{ f(2)=2(4)^2+2~~~~~~~⇒~~~~~~~f(4)=34}\)

Answer 5

The last one I posted is f(4)

And on...

So,

\(\normalsize\color{blue}{ f(5)=2(5)^2+2~~~~~~~⇒~~~~~~~f(5)=??}\) you tell me

Answer 6

I don't know what to do with the f(5)? I'm still confused

Answer 7

\(\normalsize\color{darkgoldenrod}{ f(5)=2(5)^2+2}\) . You just need to simplify the `2(5)²+2` to find the ` f(5)`.

Answer 8

52? @SolomonZelman

Answer 9

yes, 52 is right !

Answer 10

thank you sooo much!

Answer 11

Anytime:)