An important concept for Algebra II student is to pay good attention to signs.
Always remember when performing addition on integers with minus signs: Add the numbers first, then put a minus sign before the result.
-33-44 is the same as -(33+44)= -77
When adding 2 number with opposite signs, then subtract the 2 integers and the result would have the sign of the largest integer.
-44+33= - 11
44+(-33)= + 11
Always remember these formulas:
square of sum
The well-known formula for squaring a sum of two numbers:
(a + b)2 = a2 + 2ab + b2
squaring the difference of two numbers
(a- b)2 = a2 - 2ab + b2