Which of the following is a 3rd degree polynomial with roots i and 2?

D

Step-by-step explanation:

Given the roots of a polynomial, say x = a, x = b, x = c, then

(x - a), (x - b) and (x - c) are the factors and the polynomial is the product of the factors.

Note complex roots occur in conjugate pairs, thus

x = i is a root ⇒ x = - i is also a root

given roots x = 2, x = i, x = - i are roots, then

(x - 2), (x - i) and (x + i) are the factors and

f(x) = (x - 2)(x - i)(x + i)

     = (x - 2)(x² - i²)

     = (x - 2)(x² + 1)

     = x³ + x - 2x² - 2

     = x³ - 2x² + x - 2 → D

b.-4 units

all you   do is count how many times you move

step-by-step explanation:

what is the figure? attach a picture.