Question

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

Answer 1

The answer is:

f(3) = 19

Explanation:

Plug in 3 for x, and evaluate.

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

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

Simplify step by step

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

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

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

Hence, f(3) = 19.

Answer 2

19

Explanation:

the value of f(x) = 2x^2 + 1, for x = 3

f(3) = 2×3^2 + 1➡ 2×9 +1= 19