Simplify the expression (11 – 6)2 + 6 × 2 – (3 + 3)2.

5x2+6x2-6x2
Answer = 10

I got rid of the exponents (squared) by just multiplying them by themselves, BUT remember they were still Exponents (E below)
(11-6)(11-6) + 6 × 2 - (3+2)(3+2)
Follow your Order of Operation (OO):
One method is to remember the phrase "Please Excuse My Dear Aunt Sally", which forms the acronym [PEMDAS]. This stands for "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction".
So work your way from left to right, doing actions within parentheses first, next exponents... to lastly adding and or subtracting.
So we'll first do inside the parentheses:
(11-6)(11-6) + 6 × 2 - (3+2)(3+2) -->
(5)(5) + 6 × 2 - (5)(5) --> 25 + 6 × 2 - 25
Multiply (M) comes after E, so:
25 + (6×2) - 25 = 25 - 25 + (12) --> since 25-25 is 0, it's really just 0 × 12 = 12

For

   

x = -2, 2 are discontinuities because they result in a division by zero. division by zero is not allowed/undefined.  (the attachment to my answer  is the graphed function y(

since the denominator comes out to be (x-2)(x+2), that means either x = 2 or x = -2 will make the entire denominator 0 (0 times anything is 0). when the whole denominator becomes zero, you end up dividing by zero, which is undefined. that's why those two values are the discontinuities.

the general idea why it is  called a discontinuity: if you graphed the function out, there would be a visible break in the graph of the function; not everything will be connected and "continuous". 

for 

   

x = 1 is the only discontinuity because it is the only value that results in a division by zero.