To determine the function which has the largest value at x=3,
We will calculate the value of each function by substituting the value of x=3 in each of the given function.
Let us consider the first function,
Let us consider the second function,
Let us consider the third function,
Therefore, the function c(x) has the largest value at x=3.
The correct answer is: if is a root of
, then
is also a root of
.
In fact, every polynomial has real and/or complex solutions. If all solutions are real, we're good. But if not all of them are real, then the complex ones come in couple of conjugate solutions. Since and
are conjugate complex numbers, if one of them is a solution, the other must be as well.