Question

Given the function f(x) = 6x2 −13, what is f(-3)? A. -67 B. -4 C. 41 D. 311

Answer 1

-4

Explanation:

Please write f(x) as 6x^2 - 13; " ^ " indicates exponentiation.

With f(x) = 6x^2 - 13, we substitute -3 for x in both instances:

f(-3) =(-3)^2 - 13 = 9 - 13 = -4

Answer 2

Answer: C. 41

Explanation:

The quadratic function is:

`f(x) = 6x^2-13`

Then, to find
`f(-3)` you need to substitute the input value
`x=-3` into the quadratic function, to obtain the corresponding output value.

Then, when
`x=-3` the output value is:

`f(x) = 6x^2-13`

`f(-3) = 6(-3)^2-13`

`f(-3) = 6(9)-13`

`f(-3) = 41`

This matches with the option C.