Question

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

Answer 1

The answer is:

f(3) = 19

Work/explanation:

To evaluate this function, plug in 3 for x:

`\sf{f(x)=2x^2+1}`

`\sf{f(3)=2(3)^2+1}`

`\sf{f(3)=2*9+1}`

Then, according to PEMDAS, we multiply:

`\sf{f(3)=18+1}`

`\sf{f(3)=19}`

Therefore, when x = 3, the function evaluates to 19.

Answer 2

19

Explanation:

Plug in x = 3 into the function

f(x)=2x^2+1

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

f(x)=18+1

f(x)=19