Comparisons
• Hold up the ‘+’ card if you think the answer is always positive.
• Hold up the ‘-’ card if you think the answer is always negative.
The ?? Card
• Hold up the ‘??’ card if you cannot tell based on the given information (cannot be determined).
a = -2 b = 4
a + b
a = -2 b = 4
a - b
a = -2 b = 4
a + -b
a = -2 b = 4
-a + b
a = -2 b = 4
ab
a = -2 b = 4
|ab|
a = -2 b = 4
-(-(-a))
a = -2 b = 4
-(-(-b))
a = -2 b = 4
-ab
a = -2 b = 4
-(ab)
a = -2 b = 4
-(a+b)
a = -2 b = 4
-(a-b)
a = -2 b = 4
-(a- -b)
a = -2 b = 4
ab
a = -2 b = 4
-a b
a = -2 b = 4
-(a/b)
x + y
x - y
xy
x y
|x + y|
|xy|
-|x + y|
-(x + y)
-x
-(-(-y))
-(x – y)
x2
x3
-(x2)
-4y
3x
