Answer:
Step-by-step explanation:
Recall that the quadratic formula gives you the pattern to follow in order to find the solutions to a quadratic equation of the form: 
It tells us that we need to use the parameters 
and 
in the following formula in order to get the answers for the x-values that solve it:
so, in our case, 
, 
, and 
then, replacing these values in the formula, we obtain:
Which looks like the third expression you are listing (although it is a little hard to read)
c(x) = 4x - 2
d(x) = x^2 + 5x
4x - 2(x^2 + 5x)
<em><u>Using FOIL, distribute each term appropriately. </u></em>
4x^3 + 20x^2 - 2x^2 - 10x
<em><u>Combine like terms.</u></em>
4x^3 + 18x^2 - 10x is the simplified polynomials achieved when c(x) and d(x) are multiplied.
Answer: the third option, you can’t have two of the same input.
