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 the function, I plug in 3 for x.

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

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

Square 3:

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

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

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

Answer 2

f(3) =19

Explanation:

f(x)=2x^2+1

Let x = 3

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

Exponents first

=2(9) +1

Then multiply

=18+1

=19