Answer:
Step-by-step explanation:
Since this is a 4th degree polynomial, 2 of the roots will not be real. Finding them is next to impossible off a calculator until the real ones are found first. That's simple enough process.
and
Divide both sides by 5:
Rewrite to get
which simplifies down to
Taking the square root of both sides gives you the real roots of x = 2 and -2.
That leaves you with 2 roots that are imaginary. After you factor out the 2 and the -2 by synthetic division, you are left with the depressed quadratic
Factor out the 5:
So the final answer is D.