Question

If f(x) = 2x 2 + 3, find f(3).
31
15
21
39

Answer 1

21 is the right answer goodluck

Answer 2

Answer: 21

Explanation:

We are given a function
`f(x) = 2x^2 + 3`

To find the value of f(3), we need to substitute x=3 in the given function, we get

`f(3) = 2(3)^2 + 3\\\\\Rightarrow\ f(3)=2(9)+3..............[\text{Since}\ 3^2=9]\\\\\Rightarrow\ f(x)=18+3..............[\text{Since}\ 2*9=18]\\\\\Rightarrow\ f(x)=21..........[\text{Addition property}]`

Hence, the value of f(3) = 21.