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