Question

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

Answer 1

Answer:

option (b) is correct.

value of function at x = 5 is 52.

Step-by-step 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.