Question

If f(x) = 2x2 + 2, find f(5).
A.) 102
B.) 52
C.) 22
D.) −1.5

Answer 1

option (b) is correct.

value of function at x = 5 is 52.

Explanation:

Given function
`f(x)=2x^2+2`

We have to evaluate f(5) that is the value of function at x= 5.

Consider the given function
`f(x)=2x^2+2`,

To find the value of function , simply substitute the value of x as 5 ,

we get,
`f(x)=2x^2+2=2(5)^2+2`

On solving we get,

`\Rightarrow f(5)=2(5)^2+2=2(25)+2=52`

Thus, value of function at x = 5 is 52.

Thus, option (b) is correct.

Answer 2

We answer the question by substituting 5 to all the x's of the given function,
f(x) = 2x² + 2
Substituting,
f(5) = 2(5²) + 2 = 52
Thus, the f(5) is equal to 52. The answer is letter B.