Answer:
hope the screenshot will help
Step-by-step explanation:
The answer is A) k <span>∈ </span>R.
Since it is a parabola that intercepts the x-intercept at two points and since changing the value of k only changes the position of the graph in relation to the y-axis, the possible values of k is infinite.
. If we let
and
, then the given expression is equal to:

Using the Pythagorean identities
and
,



This means we can write the original expression as:
