What is the discontinuity of the function f(x) = the quantity of x squared minus 3 x minus 28, all over x plus 4?
a. (-7,-14)
b. (7,0)
c. (4,-3)
d. (-4,-11)

You get discontinuity when in this function you divide by 0. You will divide by 0 if x+4 = 0. That means that x = -4

y value for this example doesn't matter because for x = -4 you will have discontinuity. Since the only answer that has -4 as x value is D, that has to be solution.

Answer is D

(x) - (y) = (1 + 4i)

(3 + 6i) - (2 + 2i) = (1 + 4i)