What are the discontinuities of the function f(x) = the quantity of x squared plus 2 x minus 8, all over 12 x plus 24.?

If I understood your description, the function should be as follows:

f(x) = (x²-2x-8)/(12x+24), if so then let's study the denominator (12x+24)

f(x) is defined for all values except those that give to the denominator the value of ZERO. Then 12x+24 ≠ 0 or 12x ≠ - 24==> x ≠ -2

f(x) is undefined & discontinued at x=-2

The answer for this question is 80

B. 16in. x 20in , is your best bet