Question

If f(x)=2x^2+1, what is f(x) when x=3?

Answer 1

Simply replace the variable by the value to evaluate the function at that point.

f(x)=2x^2+1, when x=3, means

f(3)=2(3^2)+1

f(3)=2(9)+1

f(3)=18+1

f(3)=19

Answer 2

Option (d) is correct.

The value of given function
`f(x)=2x^2+1` at x = 3 is 19.

Explanation:

Given : Function
`f(x)=2x^2+1`

We have to evaluate the value of given function at x = 3

Consider the given function
`f(x)=2x^2+1`

put x = 3 we get,

`f(3)=2(3)^2+1`

Simplify, we have,

`f(3)=18+1`

We get,

`f(x)=19`

Thus, The value of given function
`f(x)=2x^2+1` at x = 3 is 19.