Question

If f(x) = 2x2 + 1, what is f(x) when x = 3?

Answer 1

f (3)= 2×3×2+1
f (3)=12+1
f (3)=13

Answer 2

Answer: 19

Step-by-step explanation:

Given function : $f(x)=2x^2+1$

To find the valve of f(x) at x=4.

Substitute x=3 in the given function, we get

$f(3)=2(3)^2+1\\\Rightarrow\ f(3)=2(9)+1.......[\text{ since }3^2=9]\\\Rightarrow\ f(3)=18+1\\\Rightarrow\ f(3)=19$

Hence, the value of $f(x)=2x^2+1$ at x=4 is 19.