Question

If the function f is given by f(x)=2x^2-4 then whichof the following represents the value of c such that f(c)=28?

Answer 1

The correct answer is: C. 4

Step-by-step explanation:

We will check the value of function on each option.

Given function is:

$f(x)=2x^2-4$

So,

For A. 0

$f(0)=2(0)^2-4\\=0-4\\=-4$

For B. 2

$f(2)=2(2)^2-4\\=2(4)-4\\=8-4\\=4$

For C. 4

$f(4)=2(4)^2-4\\=2(16)-4\\=32-4\\=28$

The value of function is 28 on x=4

So,

The correct answer is: C. 4

Keywords: Functions, Constants

Learn more about functions at:

• brainly.com/question/2048256
• brainly.com/question/2115122

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